Edexcel International A-Level Computer Science: Command Words and Keywords
Edexcel International A-level Computer Science: Command words and keywords
Pearson Edexcel International A-level Computer Science uses the command words defined in the specification. Pseudocode and algorithm questions require correct syntax. A-level expects more depth—data structures, algorithms, complexity.
Command words
| Command word | What to do | Common mistake |
|---|---|---|
| State | Recall; short answer | Overwriting |
| Define | Precise computing meaning | Vague |
| Describe | What the code/process does | Adding explanation |
| Explain | Why/how | Only describing |
| Suggest | Apply to context | Generic answer |
| Compare | Similarities and differences | Listing separately |
| Analyse | Break down; show relationships | Only describing |
| Evaluate | Judge; conclude with evidence | No conclusion |
| Write | Produce pseudocode/algorithm | Wrong syntax |
| Trace | Follow step by step | Missing steps |
| Calculate | Work out; show working | Wrong formula |
Computing keywords
| Term | Use correctly | Avoid |
|---|---|---|
| Algorithm | Step-by-step solution | ”Code” |
| Variable | Named storage | ”Box” |
| Array | Collection of same type | List |
| Procedure | Named block; no return | Function |
| Function | Named block; returns value | Procedure |
| Recursion | Function calls itself | ”Loop” |
| Decomposition | Breaking into sub-problems | ”Splitting” |
| Abstraction | Hiding unnecessary detail | ”Simplifying” |
| Big O notation | Time/space complexity | ”Speed” |
| Stack | LIFO | ”List” |
| Queue | FIFO | Stack |
| Validation | Check data is reasonable | Verification |
| Verification | Check data is correct | Validation |
Tips for Edexcel A-level Computer Science
- Follow pseudocode guide in specification
- Trace carefully—show each step
- Define precisely
- Suggest—apply to the scenario
- Past papers + mark schemes show acceptable pseudocode
How Tutopiya helps
Tutopiya supports Edexcel International A-level Computer Science. Explore A-level resources or book a free trial.
Based on Pearson Edexcel International A-level Computer Science specification. Check the latest specification for your exam series.
Ready to Excel in Your Studies?
Get personalised help from Tutopiya's expert tutors. Whether it's IGCSE, IB, A-Levels, or any other curriculum — we match you with the perfect tutor and your first session is free.
Book Your Free TrialWritten by
Tutopiya Team
Related Articles
A Level Subjects You Can Start From Scratch
Psychology, Business and Economics all state they expect no prior study of the subject. Starting from scratch is a designed route, and it needs orientation, not revision.
A Break After IGCSE Exams: Should They Still Prepare?
Rest first, and properly — three full weeks. The preparation that helps is about twenty hours, which fits comfortably around a genuine break rather than replacing it.
Bridging Course vs A Level Course: The Boundary
A bridging course covers what the syllabus assumes. The A Level course covers the syllabus. Starting the second one early is the commonest and least useful mistake.