There are several skills required to be a good programmer. One of these is being able to modularise programs by identifying blocks of code.
This Scratch homework is based around the “broadcast” block which can be used to modularise programs allowing greater control over order, reuse of code and gives sprites the ability to communicate with each other. The homework starts with a worked example.
There are four questions making this homework about a 20-30 minute task.
Note that question 4 will be out of reach of most younger pupils and should possibly set as a challenge (possibly with a certificate or prize for those who successfully solve it)
Students love this style of problem solving homework.