Many HCI professionals spend a good deal of their time proselytizing about user-centered design (UCD). Often, attempts at persuasion involve or even hinge on cost justification. Developing a comprehensive model of costs and benefits can be quite complex, depending on how many factors you try to include, such as the time value of money, indirect and direct effects, and tangible and intangible effects. (See Bias and Mayhew , still probably the best collection of articles on cost justification of usability, and unfortunately not "unnecessary" 10 years later as they optimistically predicted.) Because of this complexity, and because it may…
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