GCSE Computer Science

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This is a book about GCSE Computer Science. It should be useful as a revision guide or to find alternative explanations to the ones in your textbook. If you haven't heard of it then this book you can read about them at Wikipedia.

If any part of this book is unclear or even wrong then please post a comment on the discussion page or simply fix it yourself!. In particular, please say if the book assumes any knowledge or skills which not all GCSE Computer Science students have.

This book does not deal with specific programming languages there are plenty of other wikibooks available which deal adequately with each of the programming languages you might choose to use in studying GCSE Computer Science.

Course Syllabus[edit]

Please begin by selecting course you are following, ask your teacher if not sure:

How to read the book[edit]

You will meet several coloured boxes, here are their meanings:

Specification link

What the specification says you must learn for each chapter


Example questions and how to solve them


Questions to test yourself, click below


to check if you were right


Topics that aren't examined but you might be interested in

There will be a lot of concepts that you need to be familiar with, definitions are highlighted like so:

Word - meaning