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Understanding Validity and Equating in Test Development

Exploring the importance of validity in test development and evaluation, along with the concept of equating and identifying extraneous threats to validity in assessments. This resource delves into key considerations for ensuring accurate and reliable testing practices.

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Understanding Validity and Equating in Test Development

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  1. Comments Liru Zhang Delaware Department of Education

  2. Validity • Validity is the most fundamental consideration in developing and evaluating tests (Standards for Educational and Psychological Testing, 1999). Validity refers to the degree to which theory and cumulative evidence support intended uses of test scores.

  3. Equating • If you want to measure changes, don’t change the measure. • Equating is one of the important issues in assessments. • Equating is a psychometric/statistical procedure to adjust difficulty across test forms, not the test.

  4. Identify Extraneous Threats to Validity • Test specifications • Equating design • Sampling • Testing conditions • Item/rater drifting • Quality control

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