The book is intended for anyone who plans, designs and implements software products; for anyone who is involved with quality assurance; and hence for anyone who is interested in the practicability of modern concepts, methods and tools in the software development process. More and more scientists and practitioners agree that the classical software lifecycle model and associated tools no longer suffice or are even unsuitable for handling problems that arise during software development. It is often assumed that prototyping can make a contribution to solving these problems. The book strives to identify concepts and tools that support the prototyping-oriented development of software products.