This book provides in a clear way the most important aspects of modern software development. It tries to help the reader develop a competitive advantage in high tech. To begin, it presents the state of the art of the technology utilized for the reliable production of long life software, from typing requirements, maintenance and eventually the withdrawal of the product. Provides a detailed description of practical problems in software system development, explaining the different processes and what is expected from the product. Likewise, it explains how to use review lists in operating units with the aim to observe the results of the different processes. This book is very useful for electrical and electronic engineering professionals, project managers and students who plan to study a career on commercial software.