specification overview
OCR GCSE Computer Science (J277) is a single-tier linear qualification with two 1h 30m written papers. Paper 1 (Computer Systems) covers systems architecture, memory, networks, security and impacts; Paper 2 (Computational Thinking, Algorithms and Programming) tests problem-solving with OCR Exam Reference Language. Each paper is 80 marks, worth 50%.
subject content
1.1. Systems architecture
Paper 1- CPU architecture, fetch-execute cycle
- Von Neumann architecture, embedded systems
1.2. Memory and storage
Paper 1- RAM, ROM, virtual memory, secondary storage types
- Units of data, binary, hex, character sets, images, sound, compression
1.3. Computer networks, connections and protocols
Paper 1- LANs, WANs, wired vs wireless
- Network topologies (star, mesh), protocols, layers
1.4. Network security
Paper 1- Threats to networks (malware, phishing, brute force, DoS)
- Prevention methods: firewalls, encryption, user access levels, testing
1.5. Systems software
Paper 1- Operating systems and utility software
- System management, file management, user interface
1.6. Ethical, legal, cultural, environmental impacts
Paper 1- Impacts of digital technology on wider society
- Legislation: Data Protection Act, Computer Misuse Act, Copyright
2.1. Algorithms
Paper 2- Computational thinking (abstraction, decomposition, algorithmic thinking)
- Designing, creating and refining algorithms; searching and sorting
2.2. Programming fundamentals
Paper 2- Variables, constants, operators, sequence/selection/iteration
- Data types, arrays, strings, subroutines, file handling, SQL
2.3. Producing robust programs
Paper 2- Defensive design, validation, verification, authentication
- Testing (iterative vs terminal), test data
2.4. Boolean logic
Paper 2- AND, OR, NOT gates; truth tables; logic diagrams
- Combining logic gates for problem solving
2.5. Programming languages and IDEs
Paper 2- High-level vs low-level languages, translators (compilers, interpreters, assemblers)
- IDE features (editor, debugger, error diagnostics)
assessment structure
| Paper | What's assessed | Length | Marks | Weight | Question types |
|---|---|---|---|---|---|
| Paper 1 (Computer Systems) | Systems architecture, memory, networks, security, systems software, ethical impacts | 1h 30m | 80 | 50% | Multiple-choice, short-answer and extended-response questions |
| Paper 2 (Computational Thinking, Algorithms and Programming) | Algorithms, programming fundamentals, robust programs, Boolean logic, languages/IDEs | 1h 30m | 80 | 50% | Section A (50 marks): concepts, algorithms and programming theory. Section B (30 marks): practical programming using OCR Exam Reference Language or a high-level language. Includes code writing, tracing and algorithm design |
Paper 2 uses OCR Exam Reference Language (a pseudo-code). Practical programming is developed through the course but not formally assessed.
assessment objectives
| AO | What it means | Overall |
|---|---|---|
| AO1 | Demonstrate knowledge and understanding of the key concepts and principles of computer science. | 30% |
| AO2 | Apply knowledge and understanding of key concepts and principles of computer science. | 40% |
| AO3 | Analyse problems in computational terms to make reasoned judgements and to design, program, evaluate and refine solutions. | 30% |
key tips for success
Master OCR Exam Reference Language
Paper 2 uses OCR's pseudo-code. Learn the syntax (variable assignment, for loops, while loops, subroutines) from the specification appendix.
Practise trace tables
Paper 2 always tests code tracing. Practise stepping through code line by line, tracking every variable in a trace table.
Learn binary and hex fast
Paper 1 tests binary/hex/denary conversion and binary arithmetic. Drill until fast and accurate under exam pressure.
Draw truth tables and logic circuits
Paper 2 Boolean logic: sketch truth tables for AND/OR/NOT combinations and read logic gate diagrams cleanly.
Learn TCP/IP layers and protocols
Paper 1 networks section is heavy. Learn the 4-layer TCP/IP stack, common protocols (HTTP/S, FTP, SMTP, IMAP) and where they operate.
Structure ethical extended-response answers
Paper 1's 8-mark impacts question rewards balanced arguments citing specific legislation (Data Protection Act 2018, Computer Misuse Act 1990).
Where to next
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