Microcomputer-based labs, the use of real-time data capture and display in teaching, give the learner new ways to explore and understand the world. As this book shows, the international effort over a quarter-century to develop and understand microcomputer-based labs (MBL) has resulted in a rich array of innovative implementations and some convincing evidence for the value of computers for learning. The book is a sampler of MBL work by an outstanding international group of scientists and educators, based on papers they presented at a seminar held as part of the NATO Special Programme on Advanced Educational Technology. The story they tell of the development of MBL offers valuable policy lessons on how to promote educational innovation. The book will be of interest to a wide range of educators and to policy makers.