I saw an example of this and can't find it anymore. It's an interaction where you ask the learner a short-answer question, and then compare the answer with answers the expert supplies. For example, "List one or two benefits of xyz." The learner types them, clicks submit, and then sees the expert's answers (along-side would be nice, for comparison).
I might have seen it in a tutorial, and can't find the right one.
An example or two would be helpful, if anyone has one.