It turned out to be a great quick conversation for today’s podcast. The answer, if you’re wondering, is 5, for most purposes.
If you’re looking for insights, it’s 5.
If you’re looking for statistics, it’s 20.
If you’re card sorting, it’s 15.
For stable heatmaps, with eye tracking, you’ll want at least 39 participants.
Boom. Now you know! 🙂