Operating scope
Callback Attribution Window Sensitivity Study supports only a bounded operational observation when source versions, exclusions, missingness, reviewer disagreement, sensitivity checks, and limitations remain visible.
The protocol asks how declared attribution windows change the share of return visits linked to an earlier service event.
Source record
Before reviewing results, pre-register the eligible population, unit of analysis, observation window, frozen procedure date, primary outcome, exclusions, subgroup plan, and intended operational decision before inspecting results.
Retain pseudonymous job key, asset key, first visit, symptom class, return contact, return visit, elapsed time, reviewer classification, and disposition.
Exception path
Draw the sample from a versioned eligible-record roster and report selected, available, unavailable, excluded, transferred, reopened, unresolved, and late records separately.
Keep nulls visible. Preserve disagreement, missingness, late evidence, and changed classifications rather than resolving them silently.
Acceptance check
Use reviewers independently label a planned reliability subset using the same codebook; calculate raw agreement and category-specific disagreement before adjudication. Freeze transformations in a reproducible query or worksheet, preserve nulls, and show how the result changes under declared denominator, timing, and inclusion alternatives.
Describe only what the bounded records support. Do not present association, reviewer agreement, or queue timing as causation or a universal HVAC benchmark.
Decision boundary
Use pseudonymous study identifiers, least-privilege access, approved source references, field-level extraction, and a named retention owner.
The protocol prepares evidence for accountable review. Trade, safety, legal, environmental, payroll, workforce, warranty, pricing, diagnosis, and release authority remain outside the research-preparation role.
Map the next controlled handoff
Bring one recurring workflow, its source records, and the person who owns exceptions.
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