Operating scope
Technician Certification Alert Lead-Time Study supports only a bounded operational observation when source versions, exclusions, missingness, reviewer disagreement, sensitivity checks, and limitations remain visible.
The protocol asks whether credential alerts provide enough observable lead time for an authorized workforce owner to act before expiration.
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 worker key, credential class, issuer evidence, expiration, alert rule, delivery event, acknowledgement, restriction, and owner action.
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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