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This book will change your life, 15. Mai 2000
The chapter on GOMS and metrics is worth the price of admission. This distillation is very valuable. It's a simple fact that to measure and observe something is to improve it. To be able to measure at least some aspects of a particular user interface design against another and against an absolute best case is a powerful tool. While I am somewhat embarrassed to not have heard of these techniques before, I can tell from most user interfaces on the market that I am in good company.