Presents a table of discriminatory values for selecting test items based on mean differences in responses between upper and lower scorers in an normally distributed population. Provides a means for classifying items as poor, fair, or good. Describes a simple method for rank ordering accepted items. (Author/MJL)

Describes the test item analysis used in test construction. (JR)

A replicable process for improving instruction through the consistent use of student data collected before, during, and after instruction is proposed. A rational analysis of different types of error rates (theoretical, base, posttest, instructional) and discrimination indices (base, posttest) leads to a set of rules for identifying test items and…