"This book presents a refreshing but serious and conscientious approach to the work of developing useful software. Roel Wieringa, being a philosopher as well as an engineer, is determined to convey understanding along with practice, and insight along with information. He is not blinded by ephemeral fashions in notation, but draws eclectically from both new and old ideas and techniques. He looks critically at widely used techniques and notations, and judges clearly what should be adopted because it is simple and good, what must be supplemented from another source because it is deficient, and what must be discarded because it is too complicated.-From the Foreword by Michael Jackson, Independent Consultant, UK"