Constructing a key

Look at the photographs of four learners.

Imagine you are going to construct a key to help someone to identify these learners.

Step 1

Think of a way you can split the learners into two groups. For example, you could split them into male and female learners.

So, your first question could be: Is the learner female?

Step 2

Now look at just one of these groups – the female learners, for example. Think of a way to split these into two. For example, you could use the colour of their hair.

Step 3

Repeat Step 2 until you have thought of ways to identify each learner in turn.