The testlet, a bundle of test items, alleviates some problems associated with computerized adaptive testing: context effects, lack of robustness, and item difficulty ordering. While testlets may be linear or hierarchical, the most useful ones are four-level hierarchical units, containing 15 items and partitioning examinees into 16 classes. (GDC)

The viewpoint is expressed that adding to test reliability by either selecting a more homogeneous set of items, restricting the range of item difficulty as closely as possible to the most efficient level, or increasing the number of items will not add to test validity and that there is considerable danger that efforts to increase reliability may…

This paper discusses the content of the social studies tests of the 1981-82 National Assessment of Educational Progress (NAEP). Selected social studies and citizenship items were administered to 3,200 students aged 9, 13, and 17 and to adults aged 26-35. Twelve sources describing the social studies tests were reviewed, particularly the Citizenship…