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Heuristics and usability principles






 

When design principles are used in practice they are commonly referred to as heuristics. This term emphasizes that something has to be done with them when they are applied to a given problem. In particular, they need to be interpreted in the design context, drawing on past experience of, for example, how to design feed-back and what it means for something to be consistent.

 

Another form of guidance is usability principles. An example is " speak the user's language." These are quite similar to design principles, except that they tend to be more prescriptive. In addition, whereas design principles tend to be used mainly for informing a design, usability principles are used mostly as the basis for evaluating prototypes and existing systems. In particular, they provide the framework for heuris-tic evaluation (see Chapter 13). They, too, are called heuristics when used as part of










































2.6 From conceptual models to physical design 67




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