As one example, consider the issue of statistical significance. I recently had a meeting to discuss usability
engineering with the head of computer science for one of the world's most famous laboratories, and when
discussing the needed number of subjects for various tests, he immediately referred to the need for test results to
be statistically significant to be worth collecting. Certainly, for much research, you need to have a high degree
of confidence that your claimed findings are not just due to chance. For the development of usable interfaces,
however, one can often be satisfied by less rigorous tests.