How would you instrument a feature to validate qualitative findings quantitatively?

WHAT IT TESTS: bridging qualitative discovery and quantitative validation through intentional instrumentation. A GOOD ANSWER COVERS: translating each qualitative theme into a named event; distinguishing behavioral metrics from attitudinal proxies; selecting guardrail metrics to catch unintended harm; defining cohorts and sampling for statistical power; and creating a traceability matrix so every metric ties to a specific user pain point. RED FLAG: vanity metrics or page views and clicks untethered to the observed user struggle.