I think you ought to use a straightforward application of the concept as a test of understanding (e.g., if teaching how to use a hammer, have them put in some nails). Only after the concept has been verified as solidly understood should you try to make use of it as a stepping-stone to guide their understanding of a different unfamiliar topic.
I think you ought to use a straightforward application of the concept as a test of understanding (e.g., if teaching how to use a hammer, have them put in some nails). Only after the concept has been verified as solidly understood should you try to make use of it as a stepping-stone to guide their understanding of a different unfamiliar topic.