You Only Need to Test with 5 Users (2000)
Elaborate usability tests are a waste of resources. The best results come from testing no more than 5 users and running as many small tests as you can afford.
A leader in the user experience field, NN/g conducts groundbreaking research, trains and certifies UX practitioners, and provides UX consulting to clients.
Visit nngroup.com → On Hacker News Jan 2013 – Jan 2026
Design & UX 27Web & Frontend 9Tech Industry & Business 6Society, Policy & Culture 3Career & Management 2Tools & Productivity 1
Elaborate usability tests are a waste of resources. The best results come from testing no more than 5 users and running as many small tests as you can afford.
Personas are useful tools for UX work, so why do they often fail? Find out what pitfalls cause personas to fail, and how to avoid and overcome them.
Guest checkout with optional registration on e-commerce sites simplifies the purchase process and invites users to register when they feel comfortable, rather than forcing unwanted registration.
When organizations optimize metrics at the cost of all else, they expose themselves to metric corruption. Ultimately, as the Facebook scandal illustrates, they may fail their users and their business goals.
On average, UX changes have a smaller impact on quantitative metrics. This trend means that UX has substantially advanced since 2006.
Hidden features, reduced discoverability, cognitive overhead from dual environments, and reduced power from a single-window UI and low information density. Too bad.