Parts of a System

Active learning helps Year 3 students move beyond abstract ideas by letting them touch, move, and role-play with real components. When students physically act out a system, they see how parts connect and what happens when one piece is missing.

• Year 3
• Technologies
• 3 activities
• 20 min–45 min

Learning Objectives

1. Identify the distinct roles of hardware and software components within a digital system.
2. Explain how input, processing, and output devices interact to complete a task.
3. Compare the function of different hardware components, such as a keyboard and a screen.
4. Predict the consequence of a specific hardware component failure on a digital system's operation.

Simulation Game

⏱ 40 min·Whole Class

Simulation Game: The Human Computer

Assign students roles: 'Input' (keyboard), 'Processor' (brain), 'Memory' (notebook), and 'Output' (printer). Give the 'Input' a simple sum; they must pass it through the system to get the final answer displayed by the 'Output'.

Prepare & details

Differentiate between hardware and software components of a computer system.

Facilitation Tip: During The Human Computer, clearly assign roles so every student participates and understands how input leads to output.

Setup: Flexible space for group stations

Materials: Role cards with goals/resources, Game currency or tokens, Round tracker

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Stations Rotation

⏱ 45 min·Small Groups

Stations Rotation: Hardware Scavenger Hunt

Set up stations with different devices (tablet, laptop, old desktop, digital camera). Students must identify and label the input and output parts of each device using sticky notes.

Prepare & details

Explain the interaction between input, processing, and output devices.

Facilitation Tip: For the Hardware Scavenger Hunt, limit the list to items students can safely handle and label each station with a number or color.

Setup: Tables/desks arranged in 4-6 distinct stations around room

Materials: Station instruction cards, Different materials per station, Rotation timer

• Remember
• Understand
• Apply
• Analyze
• Self-Management
• Relationship Skills

Think-Pair-Share

⏱ 20 min·Pairs

Think-Pair-Share: Hardware vs. Software

Students are given a list of items (e.g., mouse, Minecraft, screen, YouTube). They must decide if each is hardware or software and explain their reasoning to a partner based on whether they can 'touch' it.

Prepare & details

Predict the impact if a key hardware component fails.

Facilitation Tip: In the Think-Pair-Share, provide sentence stems like 'I think a keyboard is ______ because…' to support language development.

Setup: Standard classroom seating; students turn to a neighbor

Materials: Discussion prompt (projected or printed), Optional: recording sheet for pairs

• Understand
• Apply
• Analyze
• Self-Awareness
• Relationship Skills

Teaching This Topic

Start with a familiar device students see every day, then open it to reveal the unseen parts. Avoid starting with definitions; instead, let students discover relationships through guided observation and role play. Research shows that concrete experiences followed by brief reflection build stronger mental models than abstract explanations alone.

What to Expect

By the end of the activities, students should point to a device and name its hardware parts, explain the difference between hardware and software, and explain why each part matters for completing a task.

Watch Out for These Misconceptions

Common Misconception

During The Human Computer, watch for students who focus only on their own role and miss how the whole chain of actions leads to the final output.

What to Teach Instead

After the activity, have the class retrace the steps: ask each role to explain what they contributed and how the next person used their input.

Common Misconception

During Think-Pair-Share, watch for students who say software is ‘inside the computer’ without linking it to rules or instructions.

What to Teach Instead

Use the game board analogy: have students stand in pairs, one as the game board and pieces (hardware) and the other as the rules (software), then switch roles to show how rules guide play.

Assessment Ideas

Quick Check

After the Hardware Scavenger Hunt, display images of common components and ask students to sort them into two columns: ‘You can touch this’ and ‘This tells the computer what to do.’ Listen for accurate use of terms like ‘keyboard’ and ‘app.’

Discussion Prompt

During The Human Computer, pause after the first round and ask: ‘What would happen if the ‘processor’ student stopped working?’ Guide students to describe how input would continue but output would not appear.

Exit Ticket

After Think-Pair-Share, hand out slips and ask students to draw one input device and one output device they use at school. Below each drawing, they write one sentence explaining its job, using the language modeled during the activity.

Extensions & Scaffolding

• Challenge: Ask students to design their own simple ‘computer system’ using craft materials that represent input, processing, storage, and output.
• Scaffolding: Provide labeled picture cards of common hardware and software so students can sort them with a partner.
• Deeper: Invite students to compare two different devices (e.g., tablet vs. desktop) and list similarities and differences in their parts and functions.

Key Vocabulary

Hardware	The physical parts of a computer system that you can touch, like the screen, keyboard, or mouse.
Software	The instructions or programs that tell the hardware what to do, like apps or games.
Input Device	A piece of hardware used to send information into a computer, such as a keyboard or microphone.
Output Device	A piece of hardware that displays or delivers information from a computer, such as a screen or printer.
Processing	The part of the computer system that takes input and uses software instructions to create output.