The author is a true test enthusiast who has spoken to several thousand people about testing. The book is the result from many years of teaching test design with the goal of creating a highly useful testbook. It is full of examples from the real world and contains exercises for most of the techniques described. It can be used as class-material or for self studies. From the forewords: This book focuses on test design, and I am glad it does. Design is the intellectual part of testing. It is the puzzle solving part. (James Bach) In this book Torbj�rn Ryber has managed to produce a text that is not only useful, but also concise and to-the-point. dEspite beeing kept to a sensible length it still manages to include guest chapters and material from renowned experts in areas such as exploratory testing and combinatorial testing, and understanding is greatly enhanced by the widespreaduse of examples that clearly demonstrates the application of the techniques. (Stuart Reid)