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
Get the weekly emailPublished 11 July 2026 · Source dated 1 May 2025
IBM research suggests 82% of ops execs expect AI agents to reinvent process automation by 2027 — but that's a forecast, not proven adoption. Worth watching, not worth over-hyping yet.

Coach
Write one sentence for your portfolio describing how you used AI in your process on a recent project — not just what it produced.
Source: ibm.com ·
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
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.
uxdesign.cc
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