A few short questions, plain English, no jargon. Your answers become Claude's standing instructions.
What event defines when a user enters a cohort? Weekly cohorts give more granularity; monthly cohorts are easier to read.
What are you measuring per cohort over time? Examples: "30-day retention rate", "cumulative revenue per user", "90-day churn rate", "feature adoption at 7 days".
What question is this cohort analysis answering? The more specific the question, the better Claude can design the right framing.