Understanding Program Purpose

National Curriculum Links

• Key Stage 3 - Computing (Computer Science strand)

  • Pupils should be taught to:
    • Design, write and debug programs that accomplish specific goals, including controlling or simulating physical systems; solve problems by decomposing them into smaller parts.
    • Use variables, sequence, selection, and repetition in programs; work with variables and various forms of input/output.
    • Understand how a computer program works by testing and debugging solutions.

• Relevant Programme of Study Objectives:

  • Understand what algorithms are and how they are implemented as programs on digital devices.
  • Understand the importance of programs meeting their intended purpose and users’ needs.

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Learning Objectives

By the end of this 60-minute session, students will:

1. Understand how computer programs are designed to meet specific purposes. (NC KS3)
2. Identify key components that make a program effective for its intended audience.
3. Explore examples of computer programs and analyse their purposes.
4. Begin to design a simple computer game with a clear purpose, using hands-on activities suitable for diverse learning needs.
5. Experience debugging simple errors, understanding how bug fixing ensures the program works as intended.

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Resources Required

• Laptops or tablets with a block-based coding environment (e.g., Scratch or MakeCode) installed or accessible offline.
• Printed storyboards and game design sheets (visual and simple language) for planning game purpose and functionality.
• Whiteboard and coloured pens for discussion and drawing flowcharts.
• Fidget tools or stress balls for students with sensory needs.
• Timer or visual timekeeper for activity pacing.

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Lesson Outline

1. Starter (10 minutes) – Hook & Discuss (Interactive)

• Activity: Show two different short computer games or animations on the screen (can be prerecorded). Ask: What do you think this program is trying to do? Who is it for? Does it do a good job?
• Use a whiteboard to map answers. Highlight words like: purpose, users, fun, challenging, educational.
• Use simple “thumbs up/down” or emoji cards for students with additional needs to express reactions.

2. Main Activity Part 1 (15 minutes) – Exploring Program Purpose

• Present a simple program demonstrating variables and choices (e.g., a quiz game or character chooser).
• Together, step through the program flow visually (using flowchart cards or on-screen animation).
• Ask: What happens when you press this button? Why does the program ask a question?
• Use coloured cards or symbols for students to identify "inputs," "decisions," and "outputs."
• Allow the students to interact and change variable values to see how the program’s purpose is achieved or broken.

3. Main Activity Part 2 (20 minutes) – Designing a Game to Meet a Purpose (Hands-on)

• Provide students with game design sheets that prompt them to:
  • Name their game and describe the purpose (e.g., to teach times tables, to entertain with a maze).
  • Outline main characters/objects.
  • List the key rules or player actions.
  • Define goals — what must the player do to 'win.'
• For ADHD/autistic learners, use step-by-step visual prompts and allow them to work physically with cards or tokens for game elements.
• Encourage students to share or discuss their game idea, using communication aids if needed.

4. Plenary (10 minutes) – Debugging & Reflecting

• Show a simple buggy version of a game and ask students to spot what doesn’t work (e.g., character doesn’t jump, or score doesn’t increase).
• Allow hands-on interaction, trying simple fixes such as changing values or correcting steps.
• Discuss: Why is debugging important to make sure the program meets its purpose?
• Reflect on learning— students use smiley face scales or verbal feedback to say how confident they feel about understanding the purpose of computer programs and making one.

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Assessment

• Formative assessment through observation of participation in discussions and activities.
• Check understanding during game design by reviewing if students clearly articulate the game’s purpose and key features.
• Evaluate ability to identify bugs and suggest fixes during plenary activity.
• Adapt questioning and support based on responses to ensure inclusion and understanding.

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Differentiation & Inclusion Strategies

• Break tasks into manageable chunks with clear visual prompts.
• Use multisensory materials (cards, drawings, interactive screens).
• Allow movement breaks and use fidget tools for sensory regulation.
• Encourage verbal, written, or alternative communication methods depending on student preference.
• Use peer support and modelling to scaffold complex ideas.
• Repeat instructions clearly and check understanding frequently.

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Extension Ideas

• Challenge students to create a simple playable prototype of their designed game in the next lesson.
• Explore different types of purposes such as educational, entertainment, accessibility-focused programs.
• Introduce concepts of user testing by having students exchange their game ideas and provide feedback.

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This lesson positions students to understand the fundamental principle that computer programs are designed with a purpose in mind, linking computational thinking with practical creativity. It uses hands-on, accessible, and interactive approaches to meet diverse learning needs effectively in line with the National Curriculum for England.