This work fully covers all course/exam requirements for existing syllabuses and forthcoming subject specifications for Advanced Level, BTEC, City and Guilds and new computer and IT technologies. Each chapter provides extra help through introductory summaries; 'Did You Know That' sections; hint boxes; screen dumps of examples; and, highlighted key text and revision summaries. Student-friendly material is supported with tables, diagrams, photographs, and examples for accessible and comprehensive learning. Revised and extended business, scientific and real-time applications chapters with past examination questions provided throughout for consolidation and practice. Full-colour sections showing the use of colour in computing are included throughout. It provides thorough coverage on the influence of the Internet.