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Test changes before customers feel them

Practical guides for product teams who want to know how a change will land before a single real customer sees it.

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Latest guides

Featured guide

Learn how A/B tests mislead product decisions through SRM, peeking, novelty, interference, bad instrumentation, weak guardrails, and subgroup harm.

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Guide

How to Run a Product Launch Pre-Mortem

Run a product launch pre-mortem that turns imagined failure into owned risks, evidence checks, mitigations, and staged rollout or rollback rules.

Guide

What Are Synthetic Users?

What are synthetic users? Learn how AI-simulated participants work, where they can screen product-change risk, and when real user research is essential.

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How to Test Product Changes Before Launch

Use a PM decision tree to test product changes before launch with research, prototypes, analytics, simulation, A/B tests, staged rollout, and monitoring.