I think that the author tried to accentuate several different aspects in the reading. The article was based on the premises of the psychology behind the product. The simplicity and ease of using the product is vitally important to its success. The affordability of the product, the perceived use, is the first judgement people make about whatever it is they are looking at. Constraints and mappings are also crucial to use and functionality of the product.
Think of a specific object that you have had difficulty using. How did design contribute to making it difficult to use? Does the usability problem arise from one of the principles that Norman discusses in this chapter?
My families van has the most confusing air conditioning system. There are far to many buttons and settings, the buttons are spaced out and not clearly labeled. The system is far too complicated to try and use without proper training. The usability problem arose from all of the principles that Norman discussed in the chapter. Poor affordability, mapping, and constraints are all contributers to a confusing air-conditioning system.
How did the designers of the iPod address the principles that Norman discusses here?
In the previous article that we read you can see the same themes that Norman discussed in this article. For example, Steve Jobs wanted a simple design that was easily operated (affordablility), as well as having constraints like size and cost, and they certainly considered the mapping of the scroll-wheel.
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