The requirement stayed. Did the behavior?

The developer finds the old path. A design note describes a customer constraint, but it is unclear whether the note still applies. The technical lead needs that answer before agreeing the scope and estimate.

The work is not simply to find a document. It is to connect the relevant decision to its source and version, then check it against the proposed change. Anything not covered by the sources still needs investigation.

For this example, a proposed evaluation would use an agreed repository snapshot and selected documents. Your team would define the questions: why was the exception introduced, what supports it today, and who can resolve the remaining uncertainty?

The comparison helps your reviewer distinguish a real difference from a question the available material cannot answer. For the sign-in change, that means checking whether the protected customer path still behaves as intended—not simply finding matching words in a document. This investigation does not change your production system.

Compare the preparation and review effort with your current process. Count unanswered questions, incorrect answers and the cost of setting up and maintaining the project knowledge—not just how quickly a search returns.

Before starting, agree when the case should stop: for example, if the necessary sources are unavailable or the product cannot support the questions. A positive result would support a separately scoped next step.