Tools

Plan and read an experiment

From hypothesis to decision: write what you expect, size the test before starting and read the result without stopping early.

The flow

1. 1Write the hypothesisFrom observation to a sentence a test can confirm or knock down, with metric, number and timeframe.Hypothesis generator
2. 2Plan the experimentHypothesis, metrics, sample, duration and decision rule in a single document, agreed before you start.Experiment planner
3. 3Work out sample size and durationHow many people each variant needs to see, and for how many weeks, for the test to detect the effect that matters.A/B test sample size calculator
4. 4Read the significanceVisitors and conversions for each variant become a p-value, a difference interval and a plain-language verdict.A/B test significance calculator
5. 5Link the metric to the product treeConnect the metric that sums up product value to the metrics and actions the team can move.Metrics tree