Experiment Brief Template for Growth PMs

Most growth experiments fail before they run — because the brief was never tight enough. Wrong metrics, missing guardrails, multiple variables changing at once: these are brief-stage problems that no amount of post-hoc analysis can fix. This template is built on the methodology Fareed Mosavat used at Slack, where experiment briefs were made mandatory before engineering picked anything up. It gives Growth PMs and data science teams a shared structure for documenting, reviewing, and approving experiments — so every test is worth running before a line of code ships. You get an Experiment Log workbook with 18 realistic sample records showing the full experiment lifecycle, a Learnings Library for structured cross-experiment pattern discovery, a Kanban pipeline for weekly growth reviews, and a Calendar timing view to surface overlap and prevent test contamination. The 9-step task enforces hypothesis structure, guardrail metric requirements, and DS review gates. Built for Growth PMs at Series B–D PLG and freemium SaaS companies scaling their experimentation practice.