The procedure for computing the discrimination indexes of items on criterion-referenced tests is the same as that for classroom achievement tests.

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Criterion-referenced tests are designed to measure how well an individual can perform a particular task or demonstrate mastery of a skill or knowledge of content, with specific criteria for what constitutes mastery. Classroom achievement tests, often norm-referenced, compare a student's performance to that of peers. The discrimination index in criterion-referenced tests focuses on distinguishing between those who have mastered content and those who have not, while in classroom achievement tests, it often aims to differentiate between higher and lower achievers across a broader range of content, leading to different computation procedures.

The Procedure for Computing the Discrimination Indexes of Items on Criterion-Referenced