Retry INCORRECT questions only

In my case, the customer required employees to score 100% on the assessment (job critical information and processes). When we initially set the quiz up so that they had to take all 50 questions over again if they didn't get them all right, with no feedback on what they had missed...students were understandably upset. One misread question and you were going back through the whole "experience" again, unsure of what you had missed.  This was not a valuable learning experience, it just created a lot of work-around behavior.  I guess people sharing answers keys is a sort of team building activity, but not really what we were after.

Reviewing only the questions they missed forced them to read those questions more carefully and focus in on what they didn't understand, rather than tediously re-doing the things that they did understand. Students believed that the number of tries were being tracked (in reality they were not, we just didn't disabuse them of the notion), so they worked towards as few tries as possible.  From a business outcome perspective, the assessments were effective in solidifying people's understanding of the subject...which is what we needed.