Teaching assistants (TAs) often have the task to compile exercise sheets for the students and need to come up with new problems for such sheets.
Let's assume that in the lecture, two methods for a certain use case were presented, and a TA is supposed to write a problem that should make the students use the second method. The first one should be cumbersome to use, so that the students can figure out themselves that the second method is the one to use in this case. Also, the problem should be somewhat motivated by an arbitrary problem from practice, so that solving the exercise sheet problem also teaches the students that the second method has its use in practice.
Now some TAs will be naturally good at such tasks, and others do not know where to start, despite knowing all of the relevant scientific results. How to teach TAs the creative skills to performing such tasks?
Note: This is a follow-up question to an earlier question on a related topic, which went without answer ideas. This new question may be of more universal interest, and I suspect that if good answers can be given, they are the same in both cases anyway.