This full-colour text covers the theory needed by students following full or short course specifications in GCSE Information and Communication Technology. In particular it provides comprehensive coverage of the AQA Specification A short course. The text is clear, concise and designed to be accessible to students of all abilities. Each chapter contains sufficient material for at least one lesson along with several GCSE standard questions. Links to relevant web sites are provided. A section providing advice on examination technique supported by model answers to selected past examination questions is also included.