Pearson Edexcel · International A Level · WCS11–WCS14
Computer Science — Keywords & Key Terms — Definitions Glossary (2026)
Pearson Edexcel International A Level Computer Science
Topic-by-topic keywords, key terms and definitions for precise exam language—separate from our revision checklists (topic coverage) and formula sheets (equations).
Keywords & Key Terms — definitions
Examiner-style keywords and definitions organised by syllabus topic. Terms are tagged Essential (start here), Core (typical exam standard), and Advanced for harder distinctions — tick each row when you can recall it. Your progress is saved in this browser for this list.
Pearson Edexcel International A Level Computer Science (WCS11–WCS14)
Pearson Edexcel International A Level Computer Science (WCS11–WCS14)
Pearson Edexcel International A Level Computer Science
Pearson International A Level Computer Science is delivered in units covering principles of computer science, algorithms, programming, databases, web technologies, and bigger-picture issues — exact unit codes (e.g. WCS series) depend on your specification version and teaching route for 2026.
Mark schemes: Mark schemes separate knowledge marks from application to scenarios. Programming: efficient algorithms, defensive coding (validation), readable structure. Database questions: entity relationships, normalisation, SQL. Extended responses: advantages/disadvantages balanced with context from stem. Check recent Principal Examiner reports for recurring misconceptions.
Active recall: 0 / 16 terms ticked
| Recalled | Topic | Level | Keyword | Definition |
|---|---|---|---|---|
| Algorithms & data structures | Core | Big-O efficiency | Compare growth of time/space with input size. | |
| Algorithms & data structures | Core | Sorting algorithms | Bubble, merge, quick — stability and best/worst case. | |
| Algorithms & data structures | Core | Abstract data types | Stack, queue, tree, graph — operations and use cases. | |
| Algorithms & data structures | Core | Graph traversal | Breadth-first vs depth-first. | |
| Algorithms & data structures | Advanced | Dijkstra’s algorithm | Shortest path — weighted graphs. | |
| Systems & databases | Core | OS scheduling | Round-robin, priority, FCFS — trade-offs. | |
| Systems & databases | Core | Virtual memory | Paging, thrashing — performance implications. | |
| Systems & databases | Core | Database normalisation | 1NF–3NF; anomalies removed. | |
| Systems & databases | Core | SQL joins | INNER, LEFT — relational algebra behind queries. | |
| Systems & databases | Core | ACID properties | Atomicity, consistency, isolation, durability — transactions. | |
| Systems & databases | Advanced | Distributed systems | CAP theorem overview — consistency vs availability. | |
| Networking, law & ethics | Core | OSI / TCP/IP | Layer responsibilities; packet structure. | |
| Networking, law & ethics | Core | DNS | Domain name resolution hierarchy. | |
| Networking, law & ethics | Core | HTTPS / TLS | Encryption in transit — certificates. | |
| Networking, law & ethics | Core | GDPR principles | Lawful basis, minimisation, rights of data subjects. | |
| Networking, law & ethics | Advanced | Professional codes | BCS/ACM style ethics — professional responsibility. |
Pair this with our revision checklists, formula sheets hub and past paper finder.
Computer Science (WCS11–WCS14) — Keywords & Key Terms FAQ
- What is on this Pearson Edexcel International A Level Computer Science keywords and key terms list?
- It is a topic-organised glossary of important computer science terms with short, exam-style definitions aligned to Pearson Edexcel International A Level Computer Science (WCS11–WCS14). It is designed for “define”, “state”, “outline” and “explain” questions where precise vocabulary earns marks.
- How should I use this Computer Science glossary alongside past papers?
- Tick terms when you can recall them without reading the answer, then check your wording against mark schemes. Pair vocabulary practice with past papers for International A Level Computer Science (WCS11–WCS14) so you apply terms in context.
- Is this the same as a revision checklist or a formula sheet?
- No. Revision checklists help you track which syllabus topics you have covered and your confidence—separate pages on Tutopiya. Formula sheets summarise equations and quantitative relationships. This page is only a definitions and key-terms glossary for Computer Science.
- Can I download this Computer Science keywords and key terms list for free?
- Yes. After a quick free sign-up you can download a UTF-8 CSV (opens in Excel or Google Sheets) or open a print-friendly page and save as PDF. Browsing the list on the page is free.
- Is this Computer Science list aligned to the WCS11–WCS14 specification?
- Topic groupings and wording follow Pearson Edexcel International A Level Computer Science for Pearson Edexcel International A Level. Always confirm final learning objectives and any regional options in your official specification and recent examiner reports for your exam session.
- Why focus on definitions instead of full notes?
- Mark schemes reward correct technical terms and clear links between ideas. A compact glossary lets you drill the exact language examiners expect for Computer Science at International A Level, separate from longer notes or topic trackers.