Still true: 5 users find most of your usability problems
NN/g's classic finding — that testing with five users uncovers most usability issues — still holds and still gets ignored by teams who think they need a 'proper' sample size.
nngroup.com
daily design digest
Published 16 July 2026 · Source dated 1 January 2026
With AI tooling dominating design chatter, it's easy to forget the cheapest, fastest usability method still works: heuristic evaluation. It costs nothing but time and catches problems before you ever test with real users.

Coach
Run a 10-minute heuristic evaluation on your own portfolio site this week and write up 3 findings, like you would for a client.
Source: uxdesign.cc ·
NN/g's classic finding — that testing with five users uncovers most usability issues — still holds and still gets ignored by teams who think they need a 'proper' sample size.
nngroup.com
Nielsen's usability heuristics remain a go-to lightweight method for catching obvious UX problems before user testing, decades after they were written. It's boring, reliable, and still worth learning properly.
interaction-design.org
Nielsen Norman Group's ongoing research keeps reinforcing that structured usability testing beats AI-generated assumptions about users. AI can speed up synthesis, but it can't replace watching real people struggle with your interface.
nngroup.com