Computers
Big O notation
Big O notation is a core A-level Computers topic. Use this page to revise the main ideas, practise the common question styles, and build confidence with trace tables, pseudocode, theory recall, and scenario questions.
What Big O notation means in A-level Computers and where it appears in exam questions.
The key vocabulary, notation, and command words students must recognise for Big O notation.
Common steps used to solve or explain Big O notation questions accurately.
Typical mistakes students make in Big O notation, and how to avoid losing method marks.
How to connect Big O notation with wider A-level Computers topics for longer answers.
A quick revision plan for practising Big O notation before timed past-paper questions.