Comparisons of pre and post-test scores over a range of course delivery modes can reveal the effectiveness over different audiences and different subjects. For example, analysis of CBT course scores at a large manufacturer revealed that CBT is a more effective way of delivering the training of detailed procedures than of facilitation skills. This may appear to be common sense, but it is helpful to have the hard data to prove it. Long-term analysis of scores reveals some unexpected outcomes. A question that is consistently failed by students can either indicate a poorly worded or ambiguous question, or a course module that does not clearly communicate the required skill or knowledge.
Experience indicates that both situations can occur.