Finding and Fixing Errors (Debugging)Activities & Teaching Strategies
Active learning works well for debugging because Year 1 students need to see errors in action to understand them. Physical movement and hands-on tasks make invisible mistakes visible, turning abstract ideas into concrete problems they can solve together.
Learning Objectives
- 1Identify the specific instruction that causes an error in a given physical sequence.
- 2Explain why a particular step in a sequence is incorrect.
- 3Demonstrate a corrected sequence of instructions to achieve a desired outcome.
- 4Compare the original, incorrect sequence with the corrected sequence.
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Pairs Activity: Human Robot Debugging
One student acts as a 'robot' following partner's oral instructions to navigate a space with obstacles. Switch roles after observing errors like missed turns. Pairs discuss and revise instructions, then retest for success.
Prepare & details
How do you know when something has gone wrong with a set of instructions?
Facilitation Tip: During Human Robot Debugging, stand slightly apart from students so they must listen carefully to your instructions without visual cues.
Setup: Groups at tables with access to research materials
Materials: Problem scenario document, KWL chart or inquiry framework, Resource library, Solution presentation template
Small Groups: Sequence Card Sort
Provide cards showing a buggy sequence, such as building a tower with wrong block order. Groups identify the error through discussion, reorder cards, and test by stacking physically. Record before-and-after sequences on paper.
Prepare & details
Can you spot what went wrong with these instructions?
Facilitation Tip: In Sequence Card Sort, arrange cards on a large table so students can see the whole sequence and discuss rearrangements as a group.
Setup: Groups at tables with access to research materials
Materials: Problem scenario document, KWL chart or inquiry framework, Resource library, Solution presentation template
Whole Class: Toy Path Challenge
Project a path for toy vehicles with deliberate errors like sharp turns. Class votes on problems, suggests fixes, and tests one at a time with the toy. Chart successful paths on the board.
Prepare & details
What do you think will happen once we fix this mistake?
Facilitation Tip: For the Toy Path Challenge, use masking tape to mark paths on the floor so students can easily adjust routes and track corrections.
Setup: Groups at tables with access to research materials
Materials: Problem scenario document, KWL chart or inquiry framework, Resource library, Solution presentation template
Individual: Personal Routine Fix
Students write or draw their morning routine with one planted error. Self-check by acting it out, note the issue, and rewrite correctly. Share one fix with the class.
Prepare & details
How do you know when something has gone wrong with a set of instructions?
Facilitation Tip: During Personal Routine Fix, provide printed steps on separate sheets so students can physically rearrange or annotate the sequence.
Setup: Groups at tables with access to research materials
Materials: Problem scenario document, KWL chart or inquiry framework, Resource library, Solution presentation template
Teaching This Topic
Teach debugging by making it social and iterative. Avoid rushing students to the 'right' answer, as this discourages exploration. Instead, model curiosity by asking open questions like 'What happens if we try this?' and normalise mistakes as part of learning. Research shows that peer discussion during debugging deepens understanding more than individual work.
What to Expect
Successful learning looks like students confidently identifying errors, explaining fixes clearly, and testing corrections until results match expectations. They should use precise language to describe what went wrong and how to correct it.
These activities are a starting point. A full mission is the experience.
- Complete facilitation script with teacher dialogue
- Printable student materials, ready for class
- Differentiation strategies for every learner
Watch Out for These Misconceptions
Common MisconceptionDuring Human Robot Debugging, students may assume the robot (partner) is not following instructions when actually the instructions contain errors.
What to Teach Instead
Listen for students blaming their partner and redirect them to re-read the steps aloud together, pointing to each instruction as they perform it.
Common MisconceptionDuring Sequence Card Sort, students may believe the sequence is correct if it looks orderly, even if the order is wrong.
What to Teach Instead
Ask students to physically act out the card order to see where the flow breaks, then discuss why the visual order can be misleading.
Common MisconceptionDuring Toy Path Challenge, students may think the toy’s path is correct if the toy moves, even if it doesn’t reach the target.
What to Teach Instead
Have students mark the toy’s actual path with chalk or tape, then compare it to the intended path to identify where the instructions failed.
Assessment Ideas
After Human Robot Debugging, give students a new 3-step physical sequence with one error. Ask them to perform it, then point to the step that caused the unexpected result.
During Sequence Card Sort, show students a completed but incorrect sequence. Ask: 'Which card is out of place? How should we move it so the sequence makes sense?'
After Personal Routine Fix, give each student a card with a simple 2-step instruction and a buggy version. Ask them to write one sentence explaining what went wrong and one sentence explaining how to fix it.
Extensions & Scaffolding
- Challenge: Give students a 5-step sequence with two errors. Ask them to find both errors and write the corrected steps.
- Scaffolding: Provide picture cues for each step in Sequence Card Sort to support students who struggle with reading.
- Deeper exploration: Introduce a 'debugging detective' role where students observe another pair’s sequence, note errors, and suggest fixes before testing them.
Key Vocabulary
| Algorithm | A set of step-by-step instructions for completing a task or solving a problem. |
| Bug | A mistake or error in a set of instructions that prevents it from working correctly. |
| Debugging | The process of finding and fixing errors, or bugs, in a set of instructions. |
| Sequence | The order in which instructions are performed. |
Suggested Methodologies
More in Algorithms and the Unplugged World
Everyday Instructions as Recipes
Students explore how simple daily tasks like making a sandwich or getting dressed are actually sequences of steps, focusing on the order and clarity of instructions.
2 methodologies
Sequencing Daily Activities
Students practice ordering a series of picture cards to represent a daily routine, understanding the importance of logical sequence.
2 methodologies
Predicting Outcomes from Instructions
Students practice 'reading' a sequence of movements or actions to predict where a person or object will end up, developing logical reasoning.
2 methodologies
Creating Simple Algorithms for Movement
Students design and act out simple movement algorithms for each other, using directional language like 'forward', 'turn left', 'step'.
2 methodologies
Pattern Recognition in Sequences
Students identify and extend simple patterns in sequences of objects, sounds, or movements, a foundational skill for computational thinking.
2 methodologies
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