Designers solve problems. Ideas and problems change, however, and new techniques and materials are invented, new production methods are developed. Designing is a process of trial and error. During the development process, designers will think up solutions or part solutions for the problems that they have been presented with. They do not know if this solution will work. Therefore, they will try out their solution, for instance using a test model or a scale model: trial. Sometimes,the solution will prove not to work: error. Sometimes the solution will work, and in that case the designer had brought his result one step closer. This book gives insight into the designprocess and provides a manual for product design with as less errors as possible. A few of the described phases are: formulating the product idea, systematic approach of the design process, market research, the (technical) concept and ergonomics.