Book excerpt: The only textbook that fully supports the Oxford AQA International GCSE Computer Science specification (9210), for first teaching from September 2017. The practical, step-by-step approach enables students to develop and apply problem solving and computational thinking skills in context. This ensures they are exam ready and prepares them for further study or life in the working world. Thoroughly prepare students for the theoretical and practical papers with extensive coding and programming support plus opportunities for practice. Clear explanations ensure students have a thorough understanding of trickier topics such as such as number representation, relational databases and SQL.