This article investigates several questions regarding the impact of different item formats on measurement characteristics. Constructed response (CR) items and multiple choice (MC) items obviously differ in their formats and in the resources needed to score them. As such, they have been the subject of considerable discussion regarding the impact of…

The importance of feedback as an aid to self-assessment is widely acknowledged. A common form of feedback that is used widely in e-learning is the use of model answers. However, model answers are deficient in many respects. In particular, the notion of a "model" answer implies the existence of a single correct answer applicable across multiple…