Usability Testing

Usability testing is deceptively simple: give a representative user a realistic task, then watch — mostly in silence — where they get stuck. Five participants typically surface the majority of serious problems, which is why it is one of the highest-leverage research methods available.

It works on anything clickable, from a paper sketch to a live product. Pairing it with a heuristic evaluation — an expert review against known usability principles — catches both the problems users hit and the ones they quietly tolerate.

In practice

Five participants, one task: “upgrade your plan and add a teammate.” Three of the five stall on the same screen — the plan picker reads as informational, not clickable. Nobody on the team had seen it, because they all knew where to click. One afternoon of testing, one obvious fix, and the upgrade flow's completion rate moves more than a quarter of visual polish ever did. The method's power is embarrassment: watching real people fail at your “obvious” design.