Sequence, Selection & Iteration — GCSE Computer Science Revision
Revise Sequence, Selection & Iteration for GCSE Computer Science. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to SubroutinesWhat is Sequence, Selection & Iteration?
Sequence, Selection & Iteration is where programming logic either becomes secure or starts to collapse. The core skill is deciding which structure fits the job: sequence for ordered steps, selection for decisions, and iteration for repetition. Strong answers explain why the chosen structure controls the program correctly.
Board notes: AQA and OCR phrase GCSE Computer Science questions differently, but both reward precise algorithm logic, accurate tracing, and technical vocabulary that matches the system or program being discussed.
Step-by-step explanationWorked example
Imagine a program that awards grades from scores. A secure answer uses selection: if the score is 80 or above, output grade A; otherwise test the next boundary. If the same process must happen for many students, then iteration wraps around that logic. The exam move is matching the structure to the task.
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Targeted practice plan
- 1Trace one example for Sequence, Selection & Iteration by hand and record each state change or data transformation.
- 2Write a short definition, then apply it to a system, algorithm, or code fragment.
- 3Check for boundary cases: empty input, maximum value, invalid state, or repeated data.
Common mistakes
- 1Choosing a loop when a one-off decision is needed, or an `if` statement when repetition is required.
- 2Writing conditions unclearly so the program path is impossible to follow.
- 3Forgetting how and when a loop stops, especially in count-controlled examples.
Sequence, Selection & Iteration exam questions
Exam-style questions for Sequence, Selection & Iteration with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Sequence, Selection & Iteration
Core concept
Sequence, Selection & Iteration is where programming logic either becomes secure or starts to collapse. The core skill is deciding which structure fits the job: sequence for ordered steps, selection f…
Frequently asked questions
How do I tell whether a question needs selection or iteration?
Ask whether the code is making one decision or repeating a process. One decision suggests selection; repetition suggests iteration.
What causes most lost marks in these programming questions?
Weak conditions, unclear loop control, and not explaining the logic path in enough detail.