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Computational Thinking – Lesson 3
Lesson ObjectiveTo be able to construct an algorithm and
flowchart for a given problem
Learning Outcomes
LO1 – Decompose a problem and design an algorithm
LO2 – Evaluate the effectiveness of an algorithm
LO3 – Construct a flowchart based on an algorithm
What can you remember
about algorithms?
Designing an algorithm
Think• What is the final goal?• What are the stages we need to go through?
Understand the problem• What are the inputs into the problem?• What will be the outputs of the problem?• In what order do the instructions need to be carried out?• What decisions need to be made in the problem?• Are any areas of the problem repeated?
What can you remember
about Flowcharts?
Flowcharts
• A flowchart is a diagram that represents a set
of instructions.
• Flowcharts normally use standard symbols to represent
the different types of instructions.
• These symbols are used to construct the flowchart and
show the step-by-step solution to the problem.
On your whiteboard draw the shape for a flowchart process and
hold it up.
On your whiteboard draw the shape for a
flowchart decision and hold it up.
On your whiteboard draw the shape that indicates the start
and end of the flowchart.
Spot the new shape?
Input/Output
Input Which is the best subject?
OutputOf course it is!
Open your Computational Thinking workbooks
Lesson 3 – Task 1
Peer Assessment
1. Have they identified the inputs to the problem?
2. Have they identified the outputs of the problem?
3. Are the steps in the correct order?
4. Have they identified any decisions?
5. Have they identified any areas that are repeated?
Open your Computational Thinking workbooks
Lesson 3 – Task 2
