3.1.1 (Representing algorithms: Definition, Decomposition, Abstraction)
AQA GCSE Computer Science 8525 (2025-2026)
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3.1 Fundamentals of algorithms
This is the first lesson of a 10-lesson unit titled Mastering Algorithms & Efficiency, aimed at GCSE students (typically 14-16 years old). The lesson introduces the fundamental concept of algorithms as sequences of steps used to complete tasks. It draws clear distinctions between designing an algorithm and implementing it in code, using relatable, real-world analogies like recipes. This lesson closely adheres to the National Curriculum for England’s Computer Science programme of study, ensuring relevant knowledge progression from key stage 3 to GCSE level.
3.2 Programming
Lesson 1 - Data Types
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Lesson 2 - Variables, Constants, and Assignment
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Lesson 3 - Arithmetic Operations
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Lesson 4 - Input and Output Fundamentals
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Lesson 5 – Relational Operations and Conditions
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Lesson 6 – Selection (IF IF–ELSE)
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Lesson 7 – Boolean Operations
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Lesson 8 – Iteration (Loops)
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Lesson 9 - Data Structure Arrays & Records
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Lesson 10 – String Handling and Type Conversion
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Lesson 11 - Random Number Generation
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Lesson 12 – Structured Programming & Subroutines (Procedures and Functions)
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Lesson 13 – Robust Programming, Testing, and Errors
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3.3 Fundamentals of data representation
3.4 Computer systems
3.5 Fundamentals of computer networks
3.6 Cyber security
3.7 Relational databases and structured query language (SQL)
3.8 Ethical, legal and environmental impacts of digital technology on wider society, including issues of privacy