NWSS Methodologies
The methodologies of the Nova Waste Service Standard. Each declares the indicators it serves via meth:forIndicator and the activity types via nwss:forActivityType.
NoteTurtle: this scheme as stated in methodologies/methodologies.ttl
@prefix meth: <http://independentimpact.org/methodology/> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix nwss: <https://nova.org.za/nwss/> .
@prefix nwss-cs: <https://nova.org.za/nwss/concepts/> .
@prefix nwss-ind: <https://nova.org.za/nwss/indicators/> .
@prefix nwss-kd: <https://nova.org.za/nwss/knowledgeDomains/> .
@prefix nwss-m: <https://nova.org.za/nwss/methodologies/> .
nwss-cs:Methodologies a skos:ConceptScheme ;
skos:prefLabel "NWSS Methodologies"@en ;
skos:definition "The methodologies of the Nova Waste Service Standard. Each declares the indicators it serves via meth:forIndicator and the activity types via nwss:forActivityType."@en ;
skos:hasTopConcept nwss-m:nwss-m001 , nwss-m:nwss-m002 , nwss-m:nwss-m003 , nwss-m:nwss-m004 ,
nwss-m:nwss-m005 , nwss-m:nwss-m006 , nwss-m:nwss-m007 , nwss-m:nwss-m008 .
nwss-m:nwss-m001 a meth:Methodology , skos:Concept ;
skos:prefLabel "NWSS-M001 — Mass and recovery accounting"@en ;
meth:methodCode "NWSS-M001" ;
skos:notation "NWSS-M001" ;
meth:hasVersion "NWSS-2026-11-09" ;
skos:definition "Accounting for waste mass from facility weighing to destination. Weighed quantities on facility weighing records are summed into mass collected by material category and stream; weighings are counted; weighed quantities on material offtake, residual disposal and organic treatment records are summed by destination; and from these the share of collected mass recovered and the collected mass per household served are computed. Applies to every facility of a project at which collected waste is weighed or from which it leaves."@en ;
nwss:principles "The weighed quantity is the unit of observation: one mass of one material category, or of uncategorised material, on one record. A blank weight is absent, never zero. Uncategorised mass is its own value, never assigned to a stream and never counted toward recovery (ADR-0007). Collection is not recovery: mass counts as recovered only when an offtake or treatment record shows it reached a recovery destination and its category is in a stream the project design declares diverted (ADR-0008). The share recovered is a share of collected mass, never a rate on generated waste, and claims nothing about what would otherwise have been landfilled. Payment rules, exceptions and payable dates belong to bounties and never change mass. NWSS computes no emission reduction."@en ;
nwss:methods "At the facility, weigh each delivery by material category at the level the project design declares, or as uncategorised when it is weighed unsorted, and record the facility, the collector by tag, the observer and the observer role on a facility weighing record. When material leaves, record a material offtake with the offtaker, the destination and the weighed quantities by category, keeping the weighbridge ticket or receipt in the evidence store; record residual deliveries to a disposal site as residual disposal and composting or other treatment as organic treatment, each with destination and weighed quantities. Compute the indicators over the records of the reporting period."@en ;
nwss:dataRequirements "Facility weighing records with their weighed quantities (material category and mass in kg), facility, collector, observer, observer role and observedAt. Material offtake records with offtaker, destination and weighed quantities; residual disposal and organic treatment records with destination and weighed quantities; the evidence item behind each by content address. From the project design: the material category level weighed, any stream overrides, the streams declared diverted and the service period. For collected mass per household served, the households actively served and the service periods from NWSS-M003."@en ;
nwss:calculationRules "Let Q be the weighed quantities with a mass on facility weighing records dated in the reporting period, each with mass m, category c, facility and collector, and let s(c) be the stream of c: the project design's override for c or its nearest broader category, else the default separation stream of c or of its nearest broader category; uncategorised has no stream. The collector of a record is the agent its collector tag resolves to at its observedAt under the scan resolution rule of ADR-0003, gaps included; a record whose tag resolves to no agent forms its own unresolved row, and a record with no facility stays in the service-area total as a row with no facility. (1) Waste mass collected C = sum of m over Q, by category, stream, facility, collector and service area. Uncategorised mass U = sum of m over Q with c uncategorised. (2) Facility weighing records = the number of facility weighing records dated in the period with at least one weighed quantity; those without one are reported alongside. (3) Let L be the weighed quantities on material offtake, residual disposal and organic treatment records dated in the period, each with destination d. Mass leaving by destination = sum of m over L, by d, category, stream and facility; reported alongside, per facility and stream, C minus the mass leaving, as information on stock. (4) Recovered mass R = sum of m over L with d in the recovery destinations (recycled, composted or treated) and s(c) in the project parameter diverted streams. Share of collected mass recovered = 100 × R / (C − U), undefined when C − U is zero; per stream, 100 × R_s / C_s. Reported alongside: R, U, the mass stockpiled and the diverted streams. Organic mass with no organic treatment or offtake record is not recovered. (5) Collected mass per household served, per service area = C / HD, where HD is the sum, over the service periods of the reporting period, of the households actively served in the period (NWSS-M003) times the days of the period. Every rate rolls up by summing its numerator and denominator over facilities, areas and periods."@en ;
nwss:outputs "Waste mass collected (kg) by material category, stream, facility, collector and service area; facility weighing records (count, NUM); mass leaving facilities by destination (kg) by destination, material category, stream and facility, with the collected-minus-leaving difference alongside; share of collected mass recovered (PERCENT) with recovered, uncategorised and stockpiled mass in kg alongside; collected mass per household served (KiloGM-PER-HH-DAY) per service area."@en ;
nwss:validationVerificationApproach "Validation: a reviewer with Knowledge and Skills Reputation in material recovery and recyclate markets checks that the project design declares the weighing level, the diverted streams and every facility, and that its offtakers are named by role. Verification of a diversion claim: a reviewer holding that domain at the standard's highest threshold (ADR-0012), who is neither the facility operator who recorded the offtake nor its offtaker, checks every recovery-destination record against its evidence item (weighbridge ticket or receipt), that the offtaker is an agent in the offtaker role, that organic recovery rests on a treatment record, and that recovered mass by stream does not exceed collected mass plus opening stock over the claim period; and samples weighing records against their scale evidence."@en ;
nwss:limitations "Collection and offtake are dated independently, so material held at a facility makes a single period's share recovered too low or above 100 percent; claims should be read over windows long enough to clear stock. A recovery destination is evidenced by the offtaker's receipt, not by what the offtaker then does with the material. Mass includes moisture and contamination as delivered. Collected mass is attributed to facilities and collectors, never to service points. Waste households take to a landfill or burn themselves is outside this accounting; only a characterisation baseline (NWSS-M008) reaches it."@en ;
nwss:rationale "Dashboards built on collected mass reported three incompatible diversion rates and counted unsorted batches as recyclable on some surfaces and not on others. One accounting from the weighed quantity to the recorded destination gives a single mass balance whose recovered part a verifier can trace to receipts, and whose quantities by material approved GHG methodologies can consume."@en ;
rdfs:comment "Distilled from novaWaste2: S/stg_collection_weight.sql (weighed quantity, blank absent), M/mart_collection_weights.sql and MIG/20261007000300_create_waste_category.sql (category to bucket, unsorted), M/mart_site_recycling_balance.sql (collected against invoiced), D/screen_meeting_pack.go:568-640, D/email_weekly.go:109-121 and D/screen_waste_collected_report.go:177-187 (the three diversion variants), D/screen_waste_collected.go:58 (weighing count), I/int_collection_payee.sql (collector by tag window), M/mart_daily_progress.sql and D/email_weekly.go:664 (mass per stand and household)."@en ;
nwss:approvalStatus nwss-cs:provisional ;
meth:forIndicator nwss-ind:waste-mass-collected , nwss-ind:facility-weighing-records , nwss-ind:mass-leaving-facilities-by-destination ,
nwss-ind:share-of-collected-mass-recovered , nwss-ind:collected-mass-per-household-served ;
nwss:forActivityType nwss-cs:facility-weighing , nwss-cs:material-offtake , nwss-cs:residual-disposal , nwss-cs:organic-treatment ;
nwss:requiresKnowledgeDomain nwss-kd:material-recovery-and-recyclate-markets , nwss-kd:organic-waste-treatment ,
nwss-kd:landfill-and-residual-disposal , nwss-kd:data-and-evidence-quality ;
skos:inScheme nwss-cs:Methodologies ;
skos:topConceptOf nwss-cs:Methodologies .
nwss-m:nwss-m002 a meth:Methodology , skos:Concept ;
skos:prefLabel "NWSS-M002 — Service point lifecycle and reach"@en ;
meth:methodCode "NWSS-M002" ;
skos:notation "NWSS-M002" ;
meth:hasVersion "NWSS-2026-11-09" ;
skos:definition "Derivation of each service point's occupancy, stage and eligibility from its dated enumeration, occupancy, enrolment, container deployment and service exit records, and the counts and rates over them: service points by occupancy and by stage, acts recorded, enrolment coverage of occupied service points, and the service exit rate. Applies to every registered service point of a project."@en ;
nwss:principles "The service point is the unit of service, identified by IRI and never by its label (ADR-0002). Stage, occupancy in force and eligibility are derived from dated acts at the time of reading and never captured (ADR-0005). Only a signed enrolment enrols. A service exit ends the enrolment it names; an exit recorded in error is withdrawn and the enrolment counts again; service after a valid exit restarts only with a new signed enrolment (ADR-0006). Acts count in the period of their own date, so later acts never rewrite earlier periods. Where projects differ, the rule names a project parameter (ADR-0010)."@en ;
nwss:methods "Enumerate each service point once, recording its type, an occupancy observation and, where people live there, a household and person count. At enrolment, record the contact outcome, the respondent's eligibility, the participant in a service point relationship and the decision, keeping the signed agreement in the evidence store. At deployment, record each container placed with its tag and the deployment kind. Record any service exit against the enrolment it ends, and any later occupancy or household count observed on other visits. Assign each service point to a zone, and each zone to a service round in the project's records. Derive and count as the rules state."@en ;
nwss:dataRequirements "Service point enumeration records with service point type, occupancy observation and household count observation; enrolment records with enrolment decision, participant, respondent eligibility and contact outcome; container deployment records with deployed containers, deployment kind and tag assignments; service exit records naming the enrolment ended; withdrawals and restatements of any of these; occupancy and household count observations on later visits; zone assignments and the zones each service round serves. From the project design: the eligibility criteria, the deployment success criterion and the service period."@en ;
nwss:calculationRules "For a service point x at time t, counting only records dated at or before t: (1) Occupancy in force = the value of the latest dated occupancy observation of x, except that a signed enrolment followed by a later successful container deployment, both dated after that observation, is evidence of occupancy, and x is then occupied; with no observation, unknown. (2) Let e be the latest signed enrolment of x. A service exit is valid unless withdrawn. Stage: exited if a valid exit dated after e, or ending e, exists and no signed enrolment is dated after that exit (when an exit and an enrolment share an instant, the exit governs); else equipped if a deployment meeting the project parameter deployment success criterion is dated after e; else enrolled if e exists; else enumerated. (3) x is eligible at t when it meets the project parameter eligibility criteria, whose default the project design may replace: stage equipped, occupancy in force neither vacant nor unknown (occupied or non-residential; a service point of type communal point is exempt from this criterion), and in a zone that a service round serves. (4) Registered service points by occupancy = count of x by occupancy in force at the end of the reporting period. (5) Service points by stage = count of x by stage at the end of the period; the eligible count alongside. (6) Service point acts recorded = count of enumeration records, signed enrolment records, deployment records meeting the success criterion (by deployment kind) and valid service exit records dated in the period. (7) Enrolment coverage = 100 × (occupied x with stage enrolled or equipped) / (occupied x), at the end of the period; alongside: occupied x not enrolled, enrolled x not equipped, and x of unknown occupancy. (8) Service exit rate = 100 × (valid exits dated in the period) / (x with a signed enrolment in force at the start of the period); alongside: the exits, and the x that restarted with a new signed enrolment after an exit in the period."@en ;
nwss:outputs "Registered service points by occupancy (count, NUM); service point acts recorded (count, NUM) by act kind and deployment kind; service points by stage (count, NUM) with eligible service points alongside; occupied service points enrolled (PERCENT) with the enrolment gap, deployment backlog and unknown-occupancy count alongside; service exit rate (PERCENT) with exits and restarts alongside; each by service point type, service area and zone. Stage, occupancy in force and eligibility per service point and date feed NWSS-M003."@en ;
nwss:validationVerificationApproach "Validation: a reviewer with Knowledge and Skills Reputation in community engagement and consent checks that the project design states its eligibility criteria and deployment success criterion and that enrolment captures consent from an eligible respondent. Verification: a reviewer in household waste service operations, who neither enrolled nor equipped the sampled service points, samples service points by stage and checks each stage against its dated records and their evidence (signed agreement by content address, geotagged deployment photograph, tag assignment), and that every exit counted is unwithdrawn and names the enrolment it ends."@en ;
nwss:limitations "Occupancy is observed rarely and can be stale; the enrolment-and-deployment rule corrects it only in one direction. Coverage depends on enumeration being complete: an unregistered service point is in no denominator. Household counts are as observed and refreshed only on visits that count again. Stage says nothing about whether service was delivered, which NWSS-M003 measures."@en ;
nwss:rationale "The dashboard behind this methodology rewrote history when a stage changed, divided shares by every registered service point including vacant ones, and applied form-version and project-specific exceptions to occupancy and placement success. Stating the derivation once over dated acts, with the differing criteria as project parameters, gives stage and coverage that any period can be recomputed for and any project can apply."@en ;
rdfs:comment "Distilled from novaWaste2: M/mart_stand_status.sql:13-25 (stage ladder, restart over termination), M/mart_stand_eligibility.sql (eligibility, occupancy precedence and its overrides at :115-122), I/int_enrollment_latest.sql (signed rule), M/mart_town_overview.sql and M/mart_process_overview.sql (stock and flow), D/screen_process_overview.go:183-186 (shares and enrolment gap), D/email_weekly.go:53-58 (terminations)."@en ;
nwss:approvalStatus nwss-cs:provisional ;
meth:forIndicator nwss-ind:service-points-by-occupancy , nwss-ind:service-point-acts-recorded , nwss-ind:service-points-by-stage ,
nwss-ind:enrolment-coverage , nwss-ind:service-exit-rate ;
nwss:forActivityType nwss-cs:service-point-enumeration , nwss-cs:participant-enrolment , nwss-cs:container-deployment , nwss-cs:service-exit ;
nwss:requiresKnowledgeDomain nwss-kd:community-engagement-and-consent , nwss-kd:household-waste-service-operations , nwss-kd:data-and-evidence-quality ;
skos:inScheme nwss-cs:Methodologies ;
skos:topConceptOf nwss-cs:Methodologies .
nwss-m:nwss-m003 a meth:Methodology , skos:Concept ;
skos:prefLabel "NWSS-M003 — Service delivery status per period"@en ;
meth:methodCode "NWSS-M003" ;
skos:notation "NWSS-M003" ;
meth:hasVersion "NWSS-2026-11-09" ;
skos:definition "Derivation of each eligible service point's service status for each service period from the service outcomes collectors record on their visits, the scheduled service day and the time of reading, and the counts and rates over those statuses: service visits by outcome, eligible service points by status, households actively served and service coverage. Applies to every recurring household or communal collection service under NWSS."@en ;
nwss:principles "A service outcome is a claim the collector makes at a visit; a service status is derived from outcomes and never captured (ADR-0005). One frame: service points eligible on the period's scheduled service day; points outside it are reported alongside, never mixed in. One visit serves one period. A period closes when its carry-forward window has passed, and its statuses are then fixed; a record submitted after closure is a late observation and changes nothing. A service is delivered when the collector reached the service point and recorded collected or no waste presented; an access failure is the household's barrier, counted apart. A visit is attributed to the collector named on its record. Evidence of collection is the recorded outcome, not mass."@en ;
nwss:methods "On each service day the collector visits the service points of the round, scans the service point or container tag, and records the service outcome; where a tag cannot be scanned the collector records the outcome without a scan. The project design sets each zone's service frequency and scheduled service day. After each period's carry-forward window, derive and fix the statuses of the period; compute the indicators over closed periods."@en ;
nwss:dataRequirements "Collection round records carrying service outcome observations, each at a service point (resolved from the scanned tag under the scan resolution rule of ADR-0003, a container tag through the deployment that placed the container), with collector, observedAt and outcome; the platform's submission time of each record; stage, eligibility and household counts from NWSS-M002; the zones each round serves and each zone's scheduled service day. From the project design: the service period, service frequency, carry-forward window, newly-placed window and eligibility criteria."@en ;
nwss:calculationRules "A visit is one service point x on one local date; of several outcomes recorded at x that date, the first present in the order collected, collected without a tag scan, no waste presented, no access to the container, no access to the service point is the visit's outcome. A scan that resolves to no service point is not a visit and is reported alongside as unresolved. (1) Service visits recorded = count of visits dated in the reporting period by outcome and by the collector on the record. For each service period p, let d be x's scheduled service day in p and W the project parameter carry-forward window (default 8 days); p closes at d + W. A visit at x dated from the start of p to d + W is assigned to the earliest such period of x that has no assigned visit with outcome collected, collected without a tag scan or no waste presented; each visit is assigned to one period only. (2) The status of x in p, first match: newly placed if x's first successful deployment under its enrolment in force is dated less than the project parameter newly-placed window (default 8 days) before d and no visit is assigned to p; served if an assigned visit is collected or collected without a tag scan; no waste presented if an assigned visit is no waste presented; access failure if an assigned visit is no access to the container or to the service point; not yet due if the reading time is before d + W; else missed. The frame is the x eligible at d. (3) Eligible service points by service status = count of (x, p) by status over closed p in the reporting period; (x, p) not yet due are reported alongside, never counted; a month holds the periods that start in it; served visits made without a tag scan, distinct x served, and ineligible x with a status are reported alongside. Missed and newly placed statuses carry no collector. (4) Households actively served = sum over eligible x with status served or no waste presented in at least one closed p of the reporting period of H(x), the latest valid household count observed at x up to the period's end; alongside: the count of such x, their person count, and those without a household count. (5) Service coverage = 100 × (S + N) / (S + N + M) over closed periods, where S, N and M are the eligible (x, p) served, no waste presented and missed; access failures, newly placed and not yet due are reported alongside."@en ;
nwss:outputs "Service visits recorded (count, NUM) by service outcome and collector; eligible service points by service status per period (count, NUM); households actively served (count, NUM) with service points and people alongside; service coverage (PERCENT) with access failures and newly placed alongside; each by period, service area and zone. The status of each (service point, period) feeds NWSS-M005 and NWSS-M007."@en ;
nwss:validationVerificationApproach "Validation: a reviewer with Knowledge and Skills Reputation in household waste service operations checks that the project design sets a service frequency and scheduled service day for every zone and declares or accepts the carry-forward and newly-placed windows. Verification of service delivery: a reviewer in that domain who never collected on the rounds verified (ADR-0012) samples closed service point-periods and checks each status against its visits and their evidence (tag scan, and the collector's location trail in the evidence store), compares the period's missed statuses with the follow-ups of NWSS-M007, and compares coverage with the participants' reports under NWSS-M005."@en ;
nwss:limitations "Outcomes are recorded by the collector, whose work a bounty pays for; tag scans, follow-ups and participants' reports are the checks, not proof. A visit recorded without a tag scan rests on the collector's report alone and is counted as served with its share reported. Statuses of an open period change as visits arrive. Attribution of missed periods to collectors needs round assignments, which belong to the operational layer, so missed statuses are attributed to zones only."@en ;
nwss:rationale "The dashboard behind this methodology counted different populations on different screens, carried a collection forward so that one late visit made two weeks look collected, and let re-reading change past weeks. One eligible frame, one visit per period and fixed closed periods give a service status that every surface reports alike and a verifier can check point by point."@en ;
rdfs:comment "Distilled from novaWaste2: M/mart_collection_status.sql and M/mart_collection_status_asof.sql:71-82 (status ladder, 8-day carry-forward and recent placement, 2-day grace), I/int_stand_scan_daily.sql (scan to stand, bin route), D/screen_service.go:433-447, D/email_weekly.go:41-47 and :94-107, D/email_missed_stands.go:255-305, D/screen_meeting_pack.go:370-394 (the four coverage variants), I/int_enrollment_latest.sql:28-29 and D/email_weekly.go:141 (households and people), I/int_weekly_picker_analysis.sql (zone modal collector, not adopted)."@en ;
nwss:approvalStatus nwss-cs:provisional ;
meth:forIndicator nwss-ind:service-visits-recorded , nwss-ind:service-points-by-service-status , nwss-ind:households-actively-served ,
nwss-ind:service-coverage-rate ;
nwss:forActivityType nwss-cs:collection-round ;
nwss:requiresKnowledgeDomain nwss-kd:household-waste-service-operations , nwss-kd:data-and-evidence-quality ;
skos:inScheme nwss-cs:Methodologies ;
skos:topConceptOf nwss-cs:Methodologies .
nwss-m:nwss-m004 a meth:Methodology , skos:Concept ;
skos:prefLabel "NWSS-M004 — Separation quality, container state and contamination"@en ;
meth:methodCode "NWSS-M004" ;
skos:notation "NWSS-M004" ;
meth:hasVersion "NWSS-2026-11-09" ;
skos:definition "Observation of the containers at sampled service points on scheduled evaluations (present, content state, condition and, for a container in use, the separation quality of its contents) and of sampled bags or containers opened in contamination audits (the streams found against the stream audited), with the rates over them: deployed containers present and usable, containers by separation quality and contaminated audit samples."@en ;
nwss:principles "Separation quality is the evaluator's rating of one container's contents against its stream on the five-level scale; only a container in use is rated (ADR-0005). An empty, misused or missing container is a container state, never a separation rating, and is counted under container retention. Rates rest on scheduled evaluations only; an unscheduled observation is kept and reported apart. Contamination is defined by the streams found in a sample, not by any project's answer codes. An evaluator never evaluates service points on a round they collected (ADR-0004)."@en ;
nwss:methods "On each scheduled evaluation, for every container deployed to the service point under its enrolment in force, record whether it is present, its content state, its condition, and for a container in use the separation quality of its contents, with a photograph. In a contamination audit, draw the sample of bags or containers of one stream the audit plan sets, open each, and record the streams whose material is found, with a photograph."@en ;
nwss:dataRequirements "Service point evaluation records fulfilling scheduled visits, with visit outcome, observer and observer role, and one container observation per deployed container: content state, condition and, where in use, separation quality; the deployments in force at the service point from NWSS-M002. Contamination audit records with one contamination observation per sample: audited stream and streams found; the facility and, where the sample is traceable, the collector. From the project design: the monitoring plan (sample size and visit window) and the audit plan's sample size."@en ;
nwss:calculationRules "Let E be the evaluation records with visit outcome completed, dated in the reporting period, that fulfil a scheduled visit inside its visit window. (1) For each e in E at service point x, let K be the containers deployed to x under its enrolment in force on e's date, the latest deployment per stream governing. Deployed containers present and usable = 100 × (containers in K observed with a content state other than container missing and a condition of very good, good, or damaged but functional) / |K|, a container in K with no observation counting as missing; counts by content state and condition are read on the axes. (2) Containers by separation quality = 100 × (ratings at level k of stream s) / (ratings of stream s), over container observations in E with content state in use; ratings on evaluations outside E are reported alongside. The headline share is clean plus minor contamination. (3) For each contamination observation o with audited stream a and streams found F, o is contaminated when F holds a stream other than a. Contaminated audit samples = 100 × (contaminated samples of stream a) / (samples of stream a) over audits dated in the period; an audit passes when none of its samples is contaminated, and the share of audits passed and the sample count are reported alongside."@en ;
nwss:outputs "Deployed containers present and usable (PERCENT) by content state, condition and stream; containers by separation quality (PERCENT) by level and stream, with unscheduled ratings alongside; contaminated audit samples (PERCENT) by audited stream, facility and collector, with audits passed and samples alongside."@en ;
nwss:validationVerificationApproach "Validation: a reviewer with Knowledge and Skills Reputation in survey and monitoring design checks the monitoring plan's sample and the audit plan. Verification of separation quality: a reviewer in source separation and behaviour change, who never collected on the rounds serving the sampled service points, checks a sample of ratings against their photographs and that no empty, misused or missing container carries a rating. Verification of contamination: a reviewer in waste characterisation and sampling, who did not audit the samples, checks audit photographs against the streams recorded."@en ;
nwss:limitations "Separation quality is a visual judgement on the day of the visit; consistency between evaluators depends on training and photographs. Rates describe the scheduled sample, not every service point, and inherit its design. A contamination audit records which streams are present, not their mass share, so it does not give a mass-based contamination rate. Load-level ratings a facility operator makes at weighing are not part of these indicators."@en ;
nwss:rationale "The weekly report folded a missing container into poor separation, dropped empty containers silently and reported some projects only, while the sorting audit was computed and never shown. Observing every deployed container, rating only those in use and defining contamination by the streams found separates container loss, household behaviour and facility-measured contamination into three checkable rates."@en ;
rdfs:comment "Distilled from novaWaste2: D/email_weekly_charts.go:53-77 and :125-186 (separation ratings consolidated, exclusions, town list), M/mart_stand_evaluations.sql (bins_still_available, bin_condition), S/stg_sorting_evaluation.sql:9-14 and M/mart_sorting_evaluations.sql (bag contamination, pass), S/stg_collection.sql:30-32 (load ratings at weighing, not adopted)."@en ;
nwss:approvalStatus nwss-cs:provisional ;
meth:forIndicator nwss-ind:containers-present-and-usable , nwss-ind:separation-quality , nwss-ind:contamination-rate ;
nwss:forActivityType nwss-cs:service-point-evaluation , nwss-cs:contamination-audit ;
nwss:requiresKnowledgeDomain nwss-kd:source-separation-and-behaviour-change , nwss-kd:waste-characterisation-and-sampling ,
nwss-kd:survey-and-monitoring-design ;
skos:inScheme nwss-cs:Methodologies ;
skos:topConceptOf nwss-cs:Methodologies .
nwss-m:nwss-m005 a meth:Methodology , skos:Concept ;
skos:prefLabel "NWSS-M005 — Household evaluation"@en ;
meth:methodCode "NWSS-M005" ;
skos:notation "NWSS-M005" ;
meth:hasVersion "NWSS-2026-11-09" ;
skos:definition "Interview of an eligible respondent at sampled service points on scheduled evaluations: satisfaction with the service on a 0 to 10 scale, perceived change since the service started for named aspects, disposal practices outside the service, and whether the service came in the last closed service period; with the distributions and rates over the answers."@en ;
nwss:principles "Only an eligible respondent answers: an adult, or the oldest household member where no adult is present, after consent. Rates rest on completed evaluations that fulfil a scheduled visit; unscheduled evaluations are kept and reported apart. Answers are self-reports and are labelled as such. One closed satisfaction scale from 0 to 10 and one five-level perceived-change scale shared across aspects (ADR-0011). An answer off the scale is not a value and is counted as not answered. Scores are reported as distributions with their mean and standard error, never as a mean of means. The respondent's identity stays in the people register (ADR-0004)."@en ;
nwss:methods "Visit the scheduled service point inside its visit window; record the contact outcome and the respondent's eligibility; with an eligible, consenting respondent ask, in this order: whether the service collected in the last service period; how satisfied the household is with the service from 0 to 10; for each aspect, how it changed since the service started; and, for each stream, what the household does with waste the service does not take. Record the visit outcome."@en ;
nwss:dataRequirements "Service point evaluation records with fulfilled scheduled visit, visit outcome, contact outcome, respondent eligibility, observer and observer role; the answers: a satisfaction score, a perceived-change level per aspect, disposal practices per stream, and whether service was received in the last closed service period; the service status of that period from NWSS-M003. From the project design: the monitoring plan's sample size and visit window."@en ;
nwss:calculationRules "Let E be the evaluation records with visit outcome completed, dated in the reporting period, that fulfil a scheduled visit inside its visit window; evaluations outside E are counted alongside and enter no value. (1) Service satisfaction score: for each e in E with an integer answer s from 0 to 10, one value s; report the count of each score, n, the mean = (sum of s) / n and its standard error = sqrt((sum of s squared − n × mean squared) / (n − 1)) / sqrt(n); windows sum n, the sum of s and the sum of s squared before dividing; answers off the scale are counted as not answered. (2) Perceived change: for each aspect a, share at level k = 100 × (e in E answering level k for a) / (e in E answering a on the scale); better = better + much better, worse = worse + much worse; off-scale answers are counted alongside. (3) Burning, burial and dumping: an e in E reports leakage when any practice reported for any stream is open burning, burning on or off the service point, burial on the service point, dumping, dumping in public or dumping on the service point, or a narrower practice of these; share = 100 × (e reporting leakage) / (e in E that asked about practices); by practice, the share reporting that practice. (4) Service received as reported = 100 × (e in E answering yes) / (e in E answering yes or no), about the last service period closed before e's date. Agreement, reported alongside: of those e whose service point had status served, no waste presented, missed or access failure in that period, the share where yes meets served or no waste presented, or no meets missed or access failure."@en ;
nwss:outputs "Service satisfaction score (UNITLESS, 0 to 10) as distribution, mean and standard error with not-answered count; participants reporting change (PERCENT) by aspect and level; service points reporting burning, burial or dumping (PERCENT), overall and by practice and stream; participants reporting service received (PERCENT) with the agreement rate alongside; each by period, service area and zone, with unscheduled evaluations counted alongside."@en ;
nwss:validationVerificationApproach "Validation: a reviewer with Knowledge and Skills Reputation in survey and monitoring design checks the sample design, the visit window and the question wording against the scales. Verification: a reviewer in community engagement and consent checks a sample of evaluations for respondent eligibility and consent, that the evaluator never collected on the rounds serving the service point, and that rates use scheduled evaluations only."@en ;
nwss:limitations "All four are self-reports, subject to courtesy bias toward the service and to recall. Perceived change is retrospective, against the start of the service, with no measured baseline. Burning and dumping are under-reported where they are frowned upon. Results describe the scheduled sample and carry no sampling weights unless the monitoring plan declares them."@en ;
nwss:rationale "Satisfaction labels were dropped from means when not numeric, quality-of-life levels were collapsed in presentation code, and burning practice and service received were asked on every evaluation and never reported. A scheduled sample, closed scales and declared exclusions turn the participant's own account into indicators that triangulate the collectors' records."@en ;
rdfs:comment "Distilled from novaWaste2: D/email_weekly.go:60-65 and :123-130, D/r/email_charts.R:305-335 (satisfaction label counts, mean and standard error), D/email_weekly_charts.go:15-35 and :79-121 (quality-of-life levels), M/mart_stand_evaluations.sql:45-53 (burn_waste, service_received, bags_received captured and not reported), D/screen_stand_evaluation.go:77."@en ;
nwss:approvalStatus nwss-cs:provisional ;
meth:forIndicator nwss-ind:service-satisfaction-score , nwss-ind:perceived-change , nwss-ind:burning-burial-and-dumping-prevalence ,
nwss-ind:service-received-as-reported ;
nwss:forActivityType nwss-cs:service-point-evaluation ;
nwss:requiresKnowledgeDomain nwss-kd:survey-and-monitoring-design , nwss-kd:community-engagement-and-consent ;
skos:inScheme nwss-cs:Methodologies ;
skos:topConceptOf nwss-cs:Methodologies .
nwss-m:nwss-m006 a meth:Methodology , skos:Concept ;
skos:prefLabel "NWSS-M006 — Collector engagement"@en ;
meth:methodCode "NWSS-M006" ;
skos:notation "NWSS-M006" ;
meth:hasVersion "NWSS-2026-11-09" ;
skos:definition "Counting the collectors a project engages and the days they work, from the service visits and facility weighing records that name them: active collectors and collector-days worked, by collector kind, facility and service area. Earnings, rates and income sharing are bounty terms and outside this methodology (ADR-0009)."@en ;
nwss:principles "A collector is an agent in the collector role, in the graph only as an IRI with its role and kind (ADR-0004). Work counts only where a record names the collector. A tag that resolves to no agent is not a collector. Days are counted, not hours or contracts, which the graph does not hold."@en ;
nwss:methods "Enrol each collector once, recording the collector kind and assigning a collector tag in the people register. On each service visit and facility weighing, scan the collector's tag so that the record names the collector. Count as the rules state."@en ;
nwss:dataRequirements "Collector enrolment records with the agent role and collector kind; service visits (NWSS-M003) and facility weighing records with collector and observedAt; the collector tag assignment windows, resolved in the people register to agent IRIs. From the project design: the time zone."@en ;
nwss:calculationRules "The collector of a record is the agent its collector tag resolves to at its observedAt under the scan resolution rule of ADR-0003, gaps included; the kind is the collector kind of that agent's collector role in force on that date. (1) Active collectors = number of distinct agents named as collector on at least one service visit or facility weighing record dated in the reporting period, by collector kind, facility and service area; an agent active at two facilities counts once in their total. Records whose collector tag resolves to no agent are counted alongside as unresolved. (2) Collector-days worked = number of distinct pairs of agent and local date with at least one such record, by collector kind, facility and service area."@en ;
nwss:outputs "Active collectors (count, NUM) and collector-days worked (count, NUM), by collector kind, facility and service area, with unresolved records alongside."@en ;
nwss:validationVerificationApproach "Validation: a reviewer with Knowledge and Skills Reputation in informal-sector inclusion and labour checks that collectors are enrolled with a kind and that collector tags are assigned in the people register, not the graph. Verification: a reviewer in data and evidence quality samples collector-days and checks each against the records that name the collector and their evidence."@en ;
nwss:limitations "Counts evidenced days, not hours, contracts or full-time equivalents, and says nothing about income or working conditions. A collector who works without scanning their tag is not counted. Gender, age and other personal attributes stay in the people register; disaggregation by them needs an aggregate from that register, outside the graph."@en ;
nwss:rationale "Collector labels on the dashboard counted unresolved tags as people and the only active-collector figure was a monthly label count. Counting agent IRIs on records gives a jobs figure that carries no personal data and leaves remuneration to bounties."@en ;
rdfs:comment "Distilled from novaWaste2: D/screen_waste_collected_report.go:188-199 (Waste Pickers count), M/mart_picker_day.sql and M/mart_picker_daily.sql (collector-day activity), I/int_collection_payee.sql (collector by tag window); M/mart_picker_pay_weekly.sql and M/mart_recycler_bonus_shares.sql left out as bounty terms."@en ;
nwss:approvalStatus nwss-cs:provisional ;
meth:forIndicator nwss-ind:active-collectors , nwss-ind:collector-days ;
nwss:forActivityType nwss-cs:collector-enrolment , nwss-cs:collection-round , nwss-cs:facility-weighing ;
nwss:requiresKnowledgeDomain nwss-kd:informal-sector-inclusion-and-labour , nwss-kd:data-and-evidence-quality ;
skos:inScheme nwss-cs:Methodologies ;
skos:topConceptOf nwss-cs:Methodologies .
nwss-m:nwss-m007 a meth:Methodology , skos:Concept ;
skos:prefLabel "NWSS-M007 — Monitoring-plan compliance"@en ;
meth:methodCode "NWSS-M007" ;
skos:notation "NWSS-M007" ;
meth:hasVersion "NWSS-2026-11-09" ;
skos:definition "Derivation of each scheduled visit's status from the records that fulfil it and its visit window, and of each missed service's follow-up from the follow-up records at the service point; with the share of scheduled evaluations completed and the share of missed services followed up."@en ;
nwss:principles "A scheduled visit is issued from the monitoring plan and never edited, only cancelled or superseded; its status is derived (ADR-0005). Attempts are records and are never filtered. A record outside the plan is an unscheduled observation: kept as evidence, never counted toward compliance. A missed service is followed up on the ground so that its cause is known. The visit window and follow-up window are project parameters (ADR-0010)."@en ;
nwss:methods "Issue scheduled visits from the monitoring plan, each for one service point and date. Visit each inside its window and record the visit outcome, linking the record to the scheduled visit. For each service that is not recorded on its scheduled service day, visit the service point inside the follow-up window and record the failure reason found and the state of its containers. Derive and count as the rules state."@en ;
nwss:dataRequirements "Scheduled visits with service point, scheduled date and any cancellation or supersession; evaluation records with the scheduled visit they fulfil, visit outcome and observedAt; missed-service follow-up records with service point, visit outcome, failure reason and observedAt; the service status of each eligible service point-period and its scheduled service day from NWSS-M003. From the project design: the monitoring plan's sample size and visit window, and the follow-up window."@en ;
nwss:calculationRules "(1) For a scheduled visit v neither cancelled nor superseded, with scheduled date t, its window runs from t to t + V, V the project parameter visit window (default 0 days: the scheduled date only). Status at reading time r: completed if a record fulfilling v, dated in the window, has visit outcome completed; else open if r is not past the window; else attempted if a record fulfilling v is dated in the window; else missed. A record fulfilling v dated outside its window does not count for v and is unscheduled. Scheduled evaluations completed = 100 × (v completed) / (v completed, attempted or missed), over v with t in the reporting period; alongside: the counts by status, visit success = completed / (completed + attempted), and the evaluation records in the period that fulfil no scheduled visit (unscheduled). (2) For each eligible service point-period (x, p) with status missed, with scheduled service day d, it is followed up when a missed-service follow-up record at x is dated from d to d + F, F the project parameter follow-up window (default 7 days). Missed services followed up = 100 × (followed up) / (all missed (x, p)) over closed periods in the reporting period; alongside: the share of those follow-ups with visit outcome completed (reach) and the count of each failure reason found."@en ;
nwss:outputs "Scheduled evaluations completed (PERCENT) with counts by status, visit success and unscheduled evaluations alongside; missed services followed up (PERCENT) with reach and failure reasons alongside; by period, service area and zone."@en ;
nwss:validationVerificationApproach "Validation: a reviewer with Knowledge and Skills Reputation in survey and monitoring design checks that the monitoring plan declares its sampling frame, sample size, visit window and follow-up window. Verification: a reviewer in field team supervision checks that scheduled visits were issued before their dates and never edited, that completed visits are inside their windows, and that no evaluation was made by the collector of the round serving the service point."@en ;
nwss:limitations "Compliance measures whether the plan was followed, not whether it was a good plan. The follow-up window opens on the scheduled service day, before the period closes, so a follow-up may find a service that was delivered late within the carry-forward window; its failure reason then records that. The visit window default is strict; a project that schedules by week declares a wider window."@en ;
nwss:rationale "Two reports computed compliance against different denominators and the follow-up rule changed between versions. Deriving every scheduled visit's status from its window, and every follow-up from the missed statuses of the eligible frame, fixes one rule for each and keeps unscheduled visits out of the rates every evaluation indicator rests on."@en ;
rdfs:comment "Distilled from novaWaste2: M/mart_evaluation_schedule_status.sql:9-17 and M/mart_evaluation_schedule_status_current.sql (schedule status), D/email_weekly.go:446-453 (compliance), D/screen_meeting_pack.go:397-458 (success rate, follow-up compliance and reach), D/email_follow_up.go:24-46 (required set and 7-day window)."@en ;
nwss:approvalStatus nwss-cs:provisional ;
meth:forIndicator nwss-ind:scheduled-evaluation-compliance , nwss-ind:missed-service-follow-up-completion ;
nwss:forActivityType nwss-cs:service-point-evaluation , nwss-cs:missed-service-follow-up ;
nwss:requiresKnowledgeDomain nwss-kd:survey-and-monitoring-design , nwss-kd:field-team-supervision ;
skos:inScheme nwss-cs:Methodologies ;
skos:topConceptOf nwss-cs:Methodologies .
nwss-m:nwss-m008 a meth:Methodology , skos:Concept ;
skos:prefLabel "NWSS-M008 — Waste characterisation baseline"@en ;
meth:methodCode "NWSS-M008" ;
skos:notation "NWSS-M008" ;
meth:hasVersion "NWSS-2026-11-09" ;
skos:definition "Measurement of how much waste households generate and what it is made of, by sampling service points, collecting all the waste they set out over a declared accumulation period, sorting it by material category and weighing it; with the waste generation rate per household per day by material category and, read against recovered mass, the recovery rate on generated waste."@en ;
nwss:principles "A generation baseline is measured, never assumed. The sample is drawn from the project's service points by a declared design and is representative of the service area it is used for. All the waste set out in the accumulation period is weighed, uncategorised fines included. Generation is per household per day, from the household count in force at the sampled service point. A recovery rate on generated waste uses the baseline of its own service area, or one the project design declares representative of it, and is never pooled across baselines."@en ;
nwss:methods "Draw a sample of occupied service points, stratified as the project design declares. On day zero ask each sampled household to keep all its waste, in bags provided, for the accumulation period. At its end collect the bags, sort each sample into material categories at the project's declared level or finer, weigh each category and the uncategorised remainder, and record the household and person count at the service point, on a waste characterisation record per sampled service point."@en ;
nwss:dataRequirements "Waste characterisation records, one per sampled service point, with weighed quantities by material category (uncategorised included), the start and end dates of the accumulation period, and a household and person count observation; the sample design. For the recovery rate on generated waste: recovered mass by service area from NWSS-M001 and households actively served per period from NWSS-M003. From the project design: the accumulation period, the sample size and strata, and which characterisation serves as baseline for each service area."@en ;
nwss:calculationRules "Let X be the sampled service points of a characterisation, each with weighed quantities m_c by material category c, household count H and accumulation period of A days (the project parameter accumulation period, default 7 days). (1) Waste generation rate = (sum over X of all m_c) / (sum over X of H × A), in kg per household per day; by category, the same with m_c of category c (and its narrower categories) only; composition share of c = rate for c / total rate; persons per household = (sum of persons) / (sum of H) reported alongside, with the sample size and dates. Service points with no household count are left out of both sums and counted alongside. (2) Recovery rate on generated waste, for a service area and stream s = 100 × R_s / (G_s × HD), where R_s is the recovered mass of stream s in the area and reporting period (NWSS-M001), G_s the generation rate of the categories in s from the area's baseline, and HD the sum over the service periods of the reporting period of the households actively served times the days of the period; for all streams, sum R over the diverted streams and G over all categories."@en ;
nwss:outputs "Waste generation rate per household (KiloGM-PER-HH-DAY) by material category and stream, with composition shares, persons per household and sample size alongside; recovery rate on generated waste (PERCENT) per service area and stream, with the baseline used alongside."@en ;
nwss:validationVerificationApproach "Validation: a reviewer with Knowledge and Skills Reputation in waste characterisation and sampling checks the sample design, size and strata, the accumulation period and the declared baseline per service area. Verification: a reviewer in that domain, who did not sort the samples, checks the sorting and weighing records against their photographs and scale evidence and that every sampled service point is either weighed or reported as lost from the sample."@en ;
nwss:limitations "A characterisation describes the season and the period sampled; generation varies by season, income and household size. Households may change what they set out while observed. Waste burnt, buried or fed to animals during the accumulation period is not in the sample. The recovery rate on generated waste applies a baseline to households served, so it is only as representative as the baseline."@en ;
nwss:rationale "The dashboard behind this standard reported mass per service point and per household as if it were generation, and its owner left the generation rate open. A measured baseline by material category is the only basis for a recovery rate on generated waste and gives approved GHG methodologies the composition they start from."@en ;
rdfs:comment "Gaps G-17 and G-01 of the distillation: novaWaste2 has a household waste analysis form but computes no indicator from it; its kg per stand and per household (M/mart_daily_progress.sql:137-138, D/email_weekly.go:664) is collected-mass intensity, not generation."@en ;
nwss:approvalStatus nwss-cs:provisional ;
meth:forIndicator nwss-ind:waste-generation-rate , nwss-ind:generation-based-recovery-rate ;
nwss:forActivityType nwss-cs:waste-characterisation ;
nwss:requiresKnowledgeDomain nwss-kd:waste-characterisation-and-sampling , nwss-kd:survey-and-monitoring-design ;
skos:inScheme nwss-cs:Methodologies ;
skos:topConceptOf nwss-cs:Methodologies .NWSS-M001 — Mass and recovery accounting
Accounting for waste mass from facility weighing to destination. Weighed quantities on facility weighing records are summed into mass collected by material category and stream; weighings are counted; weighed quantities on material offtake, residual disposal and organic treatment records are summed by destination; and from these the share of collected mass recovered and the collected mass per household served are computed. Applies to every facility of a project at which collected waste is weighed or from which it leaves.
NWSS-M002 — Service point lifecycle and reach
Derivation of each service point’s occupancy, stage and eligibility from its dated enumeration, occupancy, enrolment, container deployment and service exit records, and the counts and rates over them: service points by occupancy and by stage, acts recorded, enrolment coverage of occupied service points, and the service exit rate. Applies to every registered service point of a project.
NWSS-M003 — Service delivery status per period
Derivation of each eligible service point’s service status for each service period from the service outcomes collectors record on their visits, the scheduled service day and the time of reading, and the counts and rates over those statuses: service visits by outcome, eligible service points by status, households actively served and service coverage. Applies to every recurring household or communal collection service under NWSS.
NWSS-M004 — Separation quality, container state and contamination
Observation of the containers at sampled service points on scheduled evaluations (present, content state, condition and, for a container in use, the separation quality of its contents) and of sampled bags or containers opened in contamination audits (the streams found against the stream audited), with the rates over them: deployed containers present and usable, containers by separation quality and contaminated audit samples.
NWSS-M005 — Household evaluation
Interview of an eligible respondent at sampled service points on scheduled evaluations: satisfaction with the service on a 0 to 10 scale, perceived change since the service started for named aspects, disposal practices outside the service, and whether the service came in the last closed service period; with the distributions and rates over the answers.
NWSS-M006 — Collector engagement
Counting the collectors a project engages and the days they work, from the service visits and facility weighing records that name them: active collectors and collector-days worked, by collector kind, facility and service area. Earnings, rates and income sharing are bounty terms and outside this methodology (ADR-0009).
NWSS-M007 — Monitoring-plan compliance
Derivation of each scheduled visit’s status from the records that fulfil it and its visit window, and of each missed service’s follow-up from the follow-up records at the service point; with the share of scheduled evaluations completed and the share of missed services followed up.
NWSS-M008 — Waste characterisation baseline
Measurement of how much waste households generate and what it is made of, by sampling service points, collecting all the waste they set out over a declared accumulation period, sorting it by material category and weighing it; with the waste generation rate per household per day by material category and, read against recovered mass, the recovery rate on generated waste.