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In 1998, usability expert Rolf Molich (co-inventor with Jakob Nielsen of the heuristic evaluation method) gave nine teams three weeks to evaluate the webmail application www.hotmail.com. The experiment was part of his series of Comparative Usability Evaluations (CUEs), through which he began to identify a set of standards and best practices for usability tests. In each segment of the series, Molich asked several usability teams to evaluate a single design using the method of their choice.

From the documented results of the second test, called CUE-2, a surprising trend appeared. Contrary to claims that usability professionals operate scientifically to identify problems in an interface, usability evaluations are at best less than scientific.

In an interview with Christine Perfetti published in User Interface Engineering, Molich said:

The CUE-2 teams reported 310 different usability problems. The most frequently reported problem was reported by seven of the nine teams. Only six problems were reported by more than half of the teams, while 232 problems (75 percent) were reported only once. Many of the problems that were classified as “serious” were only reported by a single team. Even the tasks used by most or all teams produced very different results—around 70 percent of the findings for each of these common tasks were unique.

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