Active learning ideas
Selection is how programs make decisions. Using 'if-then-else' logic, students can create programs that respond differently depending on the situation. This is a fundamental concept in NCCA Strand 3, allowing for interactivity and complexity in coding projects.
Activity 01
One student acts as a 'gatekeeper' with a set of rules (e.g., 'If you are wearing blue, go left; else, go right'). Other students approach, and the gatekeeper must direct them based on the 'if-then' logic.
How do computers make decisions?
Activity 02
In small groups, students write a short 'Choose Your Own Adventure' story on cards. Each card must have a clear 'if' choice that leads to a different outcome. They swap stories and 'play' through the selection paths.
What is a conditional statement?
Activity 03
Students identify three 'if-then' decisions they made this morning (e.g., 'If it's raining, I'll take the bus'). They share these with a partner and then try to write them in a 'coding' format.
How can selection change the flow of a programme?
A few notes on teaching this unit
Watch Out for These Misconceptions
The 'else' part is always required.
Students often think every 'if' needs an 'else'. Using a simple 'If it's Tuesday, we have PE' example shows that sometimes, if the condition isn't met, the program just does nothing and moves on.
Computers can 'guess' what you mean if the condition is vague.
Computers need exact conditions (e.g., 'Score > 10' not 'Score is high'). A 'literal robot' activity where students give vague instructions helps them see why precision in selection is vital.
Methods used in this brief