Going beyond user-centered design of a product, we should be paying Tn?n7n Vh n ^ USer experience in the entire cyde of user -nershfp of a product. Idea ly, the entire process of interacting with potential customers, from the initial sales and marketing contact through the entire duration of ownership through the point at which another product is purchased or the current one upgraded, should also be included in a user-centered approach In such a scenario, companies would extend their concern to include all prepurchase and postpurchase contacts and interactions. However, let's take one step at a time, and stick to the design process.
Numerous articles and books have been written on the subject of usercentered design (UCD) (for a list of our favorites, see the web site that accompanies this book, www.wiley.com/go/usabilitytesting). However, it is important for the reader to understand the basic principles of UCD in order to understand the context for performing usability testing. Usability testing is not UCD itself; it is merely one of several techniques for helping ensure a good, user-centered design.
« Early focus on users and their tasks
■ Evaluation and measurement of product usage
■ Iterated design
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