I suspect I might be wanting a similar thing that Yigal wants. I've been fiddling using the Quiz format with calculated questions for physics practice. It seems to me there is a short coming though. For practice, (as opposed to testing) it would be useful if the student can see 'tips' or 'sample solutions' quickly. But I haven't been able to figure out a way to get them decent tips quickly.
What I've organized right now works this way:
1) I provide a question.
2) The student can try-- and submit 'check'.
3) If they do it correctly great! (They then likely don't need much more practice. We are done.)
4) If they do the problem wrong, they can retry. They can keep retrying. The interface merely tells them they did the problem wrong-- showing a red 'x' and filling the entry box red and showing them a red banner telling them they did the problem 'wrong'.
5) The student can then submit the 'final'-- at which point they get the 'feedback'-- which I can write to be useful for helping them actually learn how to do the problem if they are stuck.
This fine if the goal is assessment. In that case, I want them to try, finish the test, get graded, after which they can see the solution to the full test. But it is all very time consuming if the point is to provide multiple practice problems which students can repeat until they feel confident they can do problems correctly. For practice problems, I want to have something that mimics students being able to flip open to a text book and see examples as they try to work individual problems . It's fine with me if they mimic "monkey see-monkey do" at first-- getting 'credit' for 'solving' problems after first trying, then peeking, then just copying the solution.
Later one they can do problems without seeing the solution-- and that's gaining masterly.
If there is someway I could let the student see a worked out solution to simple problems (like "compute the centripetal acceleration give v=foo and b=bar after clicking "check" but before 'submitting final solution" that would be great for practice. But-- at least as far as I can tell-- right now, 'quizzes' require quite a few time consuming clicks for this purpose. I can make a test and advise them how to work around the 'issues' to see tips, but it's suboptimal.
(I admit this could be my deficiency as it may be I just don't understand how to get moodle to do what I want. If there is someway to let them see a worked solution after clicking 'check' but before submitting final, I'll take this all back! )