Human factors considerations are increasingly being incorporated into the product design process. Users are seen more as being important factors in the overall look and usability of products than just as passive users. We are now treated as cognitive and physical components of the person/product system. The author, who is one of the leading lights in the field of cognitive ergonomics, looks at approaches that assume that if a task can be accomplished with a reasonable degree of efficiency and within acceptable levels of comfort, then the product can be seen as fitting to the user. In this...