What it is
Captures hypothesis, variant definitions, primary metric, guardrails, and decision rules. Stops experiments from becoming opinion debates.
Concrete example
“Hypothesis: showing job ETA on the customer portal reduces ‘where is my tech’ calls by 20%. Metrics: call volume, NPS.”
When to use it
Any controlled change with a measurable hypothesis. Especially before pricing, onboarding, or activation experiments.
What Product Joi delivers
Experiment brief: hypothesis, variants, primary metric, guardrails, sample size, duration, decision rule, and rollout plan.
Turnaround
48 hours
Format
Decision-first doc
Reviewed by
Senior product lead