Observations are claims; states are derived
Status: proposed
What an observer sees is an aiao:StateClaim about an impactont:State of one entity at one time, with the observer as claimant. Examples are occupancy, a container’s presence and condition, separation quality, a household count, and a service outcome at a visit.
Everything that follows from dated records and the time of reading is derived and never captured. That covers: - a service point’s stage (enumerated, enrolled, equipped, exited); - its eligibility; - its service status for a period; - a scheduled visit’s status (completed, attempted, missed); - a collector’s attribution to a facility.
The operational layer derives the same states from the workflows to plan work, and the reporting layer counts them. Neither stores them as claims.
Instruments ask only what the ledger does not know. Site, zone, round, period status and service area follow from the scanned or selected entity and are never asked.
A service period’s statuses depend on how long a service may be carried forward, which is the project’s parameter. Once that window has passed the period closes and its statuses are fixed. A record reported after closure is a late observation and does not reopen the period.
Follows ncgs ADR-0005, ADR-0020 and ADR-0028. Distilled from docs/distillation/activities-and-workflows.md §3 and indicator judgements J11 and J25.