NWSS Indicators
Indicator definitions of the Nova Waste Service Standard, each tagged with result level, outcome domain, unit of observation and the activity types it serves. Period, service area, facility, zone, collector, material category and stream are disaggregation axes on an indicator’s data structure, never separate indicators. Rates roll up by summing numerators and denominators, never by averaging; a value is never summed across a required axis.
@prefix ind: <http://independentimpact.org/indicator-owl/> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix nwss-cs: <https://nova.org.za/nwss/concepts/> .
@prefix nwss-ind: <https://nova.org.za/nwss/indicators/> .
nwss-cs:Indicators a skos:ConceptScheme ;
skos:prefLabel "NWSS Indicators"@en ;
skos:definition "Indicator definitions of the Nova Waste Service Standard, each tagged with result level, outcome domain, unit of observation and the activity types it serves. Period, service area, facility, zone, collector, material category and stream are disaggregation axes on an indicator's data structure, never separate indicators. Rates roll up by summing numerators and denominators, never by averaging; a value is never summed across a required axis."@en ;
skos:hasTopConcept nwss-ind:service-points-by-occupancy , nwss-ind:waste-generation-rate ,
nwss-ind:service-point-acts-recorded , nwss-ind:service-visits-recorded , nwss-ind:facility-weighing-records ,
nwss-ind:scheduled-evaluation-compliance , nwss-ind:missed-service-follow-up-completion ,
nwss-ind:waste-mass-collected , nwss-ind:service-points-by-stage , nwss-ind:enrolment-coverage ,
nwss-ind:service-points-by-service-status , nwss-ind:households-actively-served , nwss-ind:service-coverage-rate ,
nwss-ind:collected-mass-per-household-served , nwss-ind:containers-present-and-usable ,
nwss-ind:active-collectors , nwss-ind:collector-days ,
nwss-ind:share-of-collected-mass-recovered , nwss-ind:mass-leaving-facilities-by-destination ,
nwss-ind:separation-quality , nwss-ind:contamination-rate , nwss-ind:service-satisfaction-score ,
nwss-ind:perceived-change , nwss-ind:burning-burial-and-dumping-prevalence , nwss-ind:service-received-as-reported ,
nwss-ind:service-exit-rate , nwss-ind:generation-based-recovery-rate .Active collectors (count)
The number of distinct agents holding the collector role who are named as collector on at least one service visit or facility weighing record dated in the reporting period. Records whose collector tag resolves to no agent are not counted and their number is reported alongside. Kind count.
Collected mass per household served (kg per household per day)
Waste mass collected in a service area in the reporting period divided by the household-days served there: the households actively served in each service period of the reporting period times the days of that period, summed. Computed per service area, never per facility or zone, because mass is attributed to facilities and collectors and not to service points. Collected mass, not generation: read beside the waste generation rate. Kind rate.
Collector-days worked (count)
The number of distinct collector-days in the reporting period: one agent in the collector role on one date in the project’s time zone, counted when that agent is named on at least one service visit or facility weighing record of that date. Kind count.
Containers by separation quality (percent)
Separation quality ratings of containers in use, made on completed service point evaluations that fulfil a scheduled visit, at each level of the separation-quality scale, divided by all such ratings of the same stream, as a percentage. Only a container whose content state is in use is rated. The levels are clean, minor, noticeable and heavy contamination, and not separated; the share clean or with minor contamination is the headline. Ratings on unscheduled evaluations are reported alongside, never in the rate. Kind rate.
Contaminated audit samples (percent)
Bags or containers opened in contamination audits in the reporting period in which material of any stream other than the audited stream was found, divided by all bags or containers of that stream opened, as a percentage. A sample with no other stream found is clean. The share of audits in which every sample is clean, and the number of samples, are reported alongside. Kind rate.
Deployed containers present and usable (percent)
Containers observed on completed service point evaluations that are present at the service point and in a usable condition (very good, good, or damaged but functional), divided by all containers deployed to those service points under their enrolment in force and observed or found missing on those evaluations, as a percentage. Observations by content state (in use, empty, used for another purpose, missing) and by condition are read on the axes. Kind rate.
Eligible service points by service status per period (count)
The number of eligible service point-periods in closed service periods of the reporting period by derived service status: served, no waste presented, access failure, missed or newly placed. Service point-periods whose period is not yet closed (not yet due) are reported alongside, never counted. A service point is in the frame for a service period when it is eligible on the period’s scheduled service day. A closed period’s statuses are fixed; a record submitted after closure is a late observation and does not change them. Points with a status that are not eligible are reported alongside, never mixed in. A monthly value sums the service point-periods of the periods that start in the month; the number of distinct service points served is reported alongside. Kind count.
Facility weighing records (count)
The number of facility weighing records dated in the reporting period that carry at least one weighed quantity. A record with no weighed quantity is not a weighing and is reported alongside. Withdrawn records never count; a restatement counts in place of what it restates. Kind count.
Households actively served (count)
The households in force at the eligible service points that had service status served or no waste presented in at least one closed service period of the reporting period, summed over those service points. The households in force are the latest valid household count observed at the service point up to the end of the period, at enrolment or on a later visit. Reported alongside: the service points counted, the people in their households, and the service points counted that have no household count. Kind count.
Mass leaving facilities by destination (kg)
The summed mass of the weighed quantities on material offtake, residual disposal and organic treatment records dated in the reporting period, by destination (recycled, composted or treated, landfilled, stockpiled), material category and facility. Reported alongside, per facility and stream: the mass collected in the same period, and the difference between collected and leaving mass, as information on stock held at the facility, never as a claim. Kind count.
Missed services followed up (percent)
Eligible service point-periods with service status missed that have a missed-service follow-up record at the service point dated inside the follow-up window, divided by all eligible service point-periods with status missed, as a percentage. The follow-up window runs from the period’s scheduled service day for the project’s follow-up window parameter. The share of follow-ups that reached a suitable respondent (visit outcome completed) and the failure reasons found are reported alongside. Kind rate.
Occupied service points enrolled (percent)
Occupied service points with a signed enrolment in force (stage enrolled or equipped) at the end of the reporting period, divided by all occupied service points then, as a percentage. Occupancy is the occupancy in force. Reported alongside: the occupied service points not enrolled (the enrolment gap), the enrolled service points not yet equipped (the deployment backlog) and the service points of unknown occupancy, which are in neither numerator nor denominator. Kind rate.
Participants reporting change since the service started (percent)
Completed service point evaluations that fulfil a scheduled visit in which the participant gave each level of the perceived-change scale (much worse to much better) for an aspect (quality of life overall, ability to dispose of waste, cleanliness of the surroundings), divided by all such evaluations answering that aspect on the scale, as a percentage. Answers off the scale are left out of the denominator and counted alongside. Better is the sum of better and much better; worse the sum of worse and much worse. Kind rate.
Participants reporting service received (percent)
Completed service point evaluations that fulfil a scheduled visit in which the participant reports that the service collected at the service point in the last closed service period, divided by all such evaluations answering the question, as a percentage. Reported alongside: the share of those evaluations in which the participant’s report agrees with the service point’s derived service status for that period (served or no waste presented against missed or access failure). Kind rate.
Recovery rate on generated waste (percent)
Recovered mass in a service area and reporting period divided by the estimated waste generated by the households actively served there: their household-days served times the waste generation rate from a waste characterisation of the same service area, or of one the project design declares representative of it, as a percentage. Computed per service area and stream, never pooled across baselines. The baseline used, its date and its sample size are reported alongside. Kind rate.
Registered service points by occupancy (count)
The number of registered service points, by the occupancy in force at the end of the reporting period: the value of the latest dated occupancy observation of the service point, except that a signed enrolment followed by a later successful container deployment, both dated after that observation, is evidence that it is occupied. A service point never observed for occupancy counts as unknown. Each service point counts once. Kind count.
Scheduled evaluations completed (percent)
Scheduled visits completed divided by scheduled visits due, as a percentage. Due: issued and neither cancelled nor superseded, with a scheduled date in the reporting period and a visit window that has passed. Completed: a record fulfilling the visit inside its window has visit outcome completed. Attempted, missed and still open visits, the visit success (completed over completed plus attempted) and the unscheduled observations recorded in the period are reported alongside; an unscheduled observation never counts toward compliance. Kind rate.
Service coverage (percent)
Eligible service point-periods in closed service periods with service status served or no waste presented, divided by those with status served, no waste presented or missed, as a percentage. Access failures, newly placed points and points whose period is not yet closed are in neither numerator nor denominator and are reported alongside with their counts. Rolled up over zones, service areas and periods by summing numerators and denominators. Kind rate.
Service exit rate (percent)
Valid service exits dated in the reporting period divided by the service points with a signed enrolment in force at the start of the period, as a percentage. A withdrawn exit never counts. Reported alongside: the number of exits, and the service points that restarted service with a new signed enrolment after an exit in the period. Rolled up over areas by summing exits and enrolments; over periods by summing exits and the period-start enrolments. Kind rate.
Service point acts recorded (count)
The number of dated acts at service points in the reporting period, by kind: service point enumerations, signed enrolments, successful container deployments (first or redeployment) and service exits. Each act counts in the period of its own date and is never moved by a later act. An enrolment counts only when its decision is signed; a deployment only when it meets the project’s deployment success criterion; a withdrawn record never counts, and a restatement counts in place of what it restates. Kind count.
Service points by stage (count)
The number of registered service points by the stage derived from their dated acts at the end of the reporting period: enumerated, enrolled, equipped or exited. Enrolled: a signed enrolment is in force. Equipped: enrolled, with a successful container deployment dated after that enrolment. Exited: a valid service exit ended the latest signed enrolment and no signed enrolment is dated after it. A withdrawn exit never counts, so the enrolment it ended counts again. The number of eligible service points (by default: equipped, enrolment in force, occupancy in force neither vacant nor unknown unless a communal point, in a zone a service round serves) is reported alongside. Kind count.
Service points reporting burning, burial or dumping (percent)
Completed service point evaluations that fulfil a scheduled visit in which the participant reports disposing of any waste by open burning, burial or dumping, on or off the service point, divided by all such evaluations that asked about disposal practices, as a percentage. With the practice axis, the share reporting that practice; a participant may report several, so practice values are never summed. Kind rate.
Service satisfaction score (0 to 10)
The participant’s satisfaction with the service on a closed scale from 0 (completely unsatisfied) to 10 (completely satisfied), one value per completed service point evaluation that fulfils a scheduled visit. Reported as the distribution of scores and as their mean with its standard error over the period’s evaluations, computed from the summed scores and counts, never as a mean of means. An answer outside the scale or not given is not a score and is counted alongside as not answered. Kind measure.
Service visits recorded, by service outcome (count)
The number of collector visits to service points recorded in the reporting period, by the service outcome the collector recorded: collected, no waste presented, no access to the container, no access to the service point, collected without a tag scan. A visit is one service point on one date; of several outcomes recorded at the same point on the same date, a collection counts. Each visit is attributed to the collector named on its record. Scans that resolve to no service point at the time of the scan are not visits and are reported alongside as unresolved. Kind count; the share of collections made with a tag scan is read from the outcome axis.
Waste generation rate per household (kg per household per day)
The mass of waste the households at sampled service points set out over a waste characterisation’s declared accumulation period, per household per day, by material category: the summed mass of the samples divided by the summed household-days (households in force at each sampled service point times the days of its accumulation period). The composition of the waste is this value by material category over its total. Uncategorised mass is its own category. Persons in the sample are reported alongside, so a per-person rate can be read. Kind rate.
Waste mass collected (kg)
The summed mass of the weighed quantities on facility weighing records dated in the reporting period, by material category and by the stream the project design assigns each category. A weighed quantity is one non-blank mass of one category, or of uncategorised material; a blank weight is absent, not zero. Uncategorised mass is reported as its own value and never assigned to a stream. Withdrawn records never count and a restatement counts in place of what it restates. No payment rule, exception or payability date applies to mass. Collection is not recovery: this indicator makes no claim about where the material went. Kind count.