Chapter 4
Summary
This chapter focuses on the constraints commonly faced by designers. These include physical, cultural, and semantic constraints. The author uses the example of a lego motorcycle to demonstrate these concepts by pointing out that while the components of the motorcycle are largely interchangeable, the cultural and semantic constraints would not be met and most people would no longer recognize the toy as a motorcycle. A discussion of logical constraints is then included later. Norman then returns to the more specific topic of door design touched on in earlier chapters, and closes the chapter with some insights on how to improve light switches so that they are less ambiguous.
Discussion
Norman has some excellent points in this chapter, although I feel in general most doors are apparent in their use. The cases where poor design was used however do stand out in my mind. Light switches are a slightly different manner. Having unlabeled switches is generally alright, provided that there aren't a great number of lights in the vicinity of the switch. I can think of maybe one or two instances in my own apartment where the switches could be labeled, but in general it is not necessary as most people learn very quickly. Switches in public places however could stand to benefit greatly from improved design, and would probably be more worth the investment.
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