The problems stated at the outset were: to discover whether information provided by confidence testing would result in a more accurate assessment of student knowledge so more personal individualized instruction could be presented, and whether sufficient precise data could be attained to be of significant aid in curriculum planning. Analysis has…

In latent trait models the standard procedure for handling the problem caused by guessing on multiple choice tests is to estimate a parameter which is intended to measure the "guessingness" inherent in an item. Birnbaum's three parameter model, which handles guessing in this manner, ignores individual differences in guessing tendency. This paper…