Why we picked it Most founders either stop at two chats with friendly users or interview forever and never ship. Seaman, a UX researcher, gives you a concrete starting formula (begin at 5, add more for complex domains, multiply by personas) and a clear stop signal: when interviews start repeating and stop teaching you anything new, that is saturation and it is time to move. It reframes the real question from a magic number to noticing when you have stopped learning.
The Right Number of User Interviews
From Medium by Mitchel Seaman About a 10 minute read
- Start around 5 interviews per persona and add more only if the domain is genuinely complex or the users vary a lot.
- The point to stop is saturation: when new conversations mostly echo what you already heard, more interviews are wasted time.
- There is no single correct number, so treat any count as a planning tool, not a target to hit before you are allowed to build.