1. Ask students what happens when it snows a lot (paying attention to how their daily routines and in particular transportation)

2. Since it’s difficult to keep roads clear when it is snowing, we are going to design and code our own snow patrol robot

3. In small groups, students should use A3 paper to design an area of a town with roads and houses for Marty to walk around and collect snow from using cotton wool balls as snow on the roads (reminding students they will need to think where in their town the collected snow should go)

4. Using cardboard, tape and scissors, ask groups to design a scoop that Marty can carry around to collect the snow on the road

5. Ask students to try testing out their design on the A3 paper that has roads and snow on and hopefully they should realise that the built-in walk command on Scratch moves Marty’s arms which may not work with their scoop design

6. Students should code their own walking function (see Lesson 1.13 for more details on this) before testing how much snow they can collect now and discuss how efficient their snow collecting system is