Step one

What are you teaching?

Pick the one closest to the class you are covering. If they left you nothing at all, take the last one.

Step two

How many crews?

Groups of four or five, off the seating they are already in. Do not move anybody.

Step three

Which class is this?

Anything you will recognise, like 8E Maths. The scores are kept against this name on this computer, so next time you take them you pick up where you left off.

Never run it before? The first five minutes is what to say, word for word, from walking in the door.