Defensive Design Quiz - GCSE Computer Science

58 auto-marked questions covering input validation, authentication and maintainability — one of the most exam-heavy, mark-losing topics in Component 2.
Full description:
Defensive design is a topic students consistently underperform on, because it’s easy to confuse validation with authentication, or miss the difference between a range check and a type check. This quiz drills exactly those distinctions with 58 targeted questions, each with a full explanation so mistakes actually get corrected rather than just marked wrong.
• 58 auto-marked questions, straight from the OCR/Cambridge specification, section 2.3
• Covers input validation (range, length, presence and type checks), authentication, and maintainability (comments, indentation, naming conventions)
• Every question includes a full worked explanation, not just a correct answer
• Self-marking — ideal for independent revision with no teacher input needed
• Runs as a single HTML file: no login, no install, works on any device
Use it as a revision homework set before a Component 2 mock, a retrieval-practice starter, or cover work that still tests real understanding.