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Judgment & ambiguity · When to escalate

Partway through data collection you realize the screening criteria in the approved protocol are letting in respondents who don’t truly fit the target — a design flaw, not a field error. Fixing it means a protocol amendment. How do you handle the deviation?

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A protocol is a commitment, not a suggestion, so the moment I believe the design is admitting the wrong people, I stop treating it as something I can quietly correct.

The full answer: structure, worked example, likely follow-up.

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