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Beyer, H.R. & Holtzblatt, K. (1998) Contextual Design: Defining Customer-Centered Systems, San Francisco, CA, Morgan Kaufman.
This book is a practical guide for anyone trying to design systems that reflect the way customers do their work. The authors developed some of the key techniques discussed , such as Contextual Enquiry and User Environment Design. A detailed account of them is provided.
Carroll, J.M. (1995) Scenario-Based Design, New York, NY, John Wiley & Sons.
This book is a collection of papers from experts on the use of scenarios in UCD. It discusses an array of scenario-based design approaches and demonstrates the practical application of scenarios across the development life cycle. In fact, it presents a scenario perspective on HCI.