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3.2 ProgrammingIntroduction

Building Software Armour

Part of Defensive Design · GCSE GCSE Computer Science revision

This introduction covers Building Software Armour within Defensive Design for GCSE Computer Science. Revise Defensive Design in 3.2 Programming for GCSE Computer Science with 15 exam-style questions and 8 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 1 of 6 in this topic. Use this introduction to connect the idea to the wider topic before moving on to questions and flashcards.

Topic position

Section 1 of 6

Practice

15 questions

Recall

8 flashcards

Building Software Armour

Defensive design is programming like a pessimist - assuming everything that can go wrong, will go wrong. It's like building a castle with thick walls, a moat, and guards. You don't wait for attackers - you prepare for them. This means checking inputs, handling errors gracefully, and writing code others can understand. A good programmer doesn't trust users to enter sensible data or other programmers to use functions correctly!

Keep building this topic

Read this section alongside the surrounding pages in Defensive Design. That gives you the full topic sequence instead of a single isolated revision point.

Defensive Design PrinciplesDeep Dive: Maintainable CodeMemory Trick: VSCAM

Practice Questions for Defensive Design

What is the purpose of input validation in a program?

  • A. To check that the user is who they claim to be
  • B. To check that input data meets specified rules before processing
  • C. To encrypt data before it is stored
  • D. To remove duplicate records from a database
1 markfoundation

Describe three different types of validation check, giving an example of each.

3 marksstandard

Quick Recall Flashcards

Why use comments?
To explain code so others can understand and maintain it
What is authentication?
Verifying a user's identity before granting access to a system

15 questions on Defensive Design — practise free

Instant marking, adaptive difficulty, and 8 spaced repetition flashcards. Free until your GCSEs.

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