The Construction of Parallel Tests From IRT-Based Item Banks

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Abstract
The construction of parallel tests from IRT-based item banks is discussed. Tests are considered to be parallel whenever their information functions are identical. Simultaneous and sequential parallel test construction methods based on the use of 0–1 programming are examined for the Rasch and 3-parameter logistic model. Sequential methods construct the tests one after another; simultaneous methods construct them all at the same time. A heuristic procedure is used for solving the 0–1 programming problems. Satisfactory results are obtained, both in terms of the CPU-time needed and differences between the information functions of the parallel tests selected.