Most of us have probably violated all sorts of good UI principles out of either haste or ignorance, but our crimes are mitigated by the fact that for the overwh

Most of us have probably violated all sorts of good UI principles out of either haste or ignorance, but our crimes are mitigated by the fact that for the overwhelming majority of software the number of users, and hence the number cursing the idiot who designed this crappy interface, is extremely low and/or constrained by the bespoke nature of the application; hence the investment in time and money to perform this level of rigour is not justified. The only time I've seen UI work carried out with this level of care was for an air traffic control system, where of course the consequences of a poor design can have significant and fatal consequences.