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This book reviews important technologies for software development with a particular focus on Web applications. In reviewing these technologies I put emphasis on underlying principles and basic concepts, rather than meticulousness and completeness. In design and documentation, if conflict arises, clarity should be preferred to precision because, as will be described, the key problem of software development is having a functioning communication between the involved human parties. My main goal in writing this book has been to make it useful. The developer should always keep in mind that software is written for people, not for computers. Computers just run software-a minor point. It is people who understand, maintain, improve, and use software to solve problems. Solving a problem by an effective abstraction and representation is a recurring theme of software engineering. The particular technologies evolve or become obsolete, but the underlying principles and concepts will likely resurface in new technologies
