Abstract
Abstract Item response theory (IRT) provides a method to determine the amount of psychometric information each item (i.e., item information function) and combination of items (i.e., test information function) provides in the estimation of an examinee's ability. In a 1977 paper, Lord described a basic four‐step procedure for using these functions to construct a test using calibrate items from a bank. Lord's procedure requires specifying a target function, selecting items from the bank to fill this target, adding the item information functions together during the selection process, and continuing until the test information function approximates the target function. Some key issues related to specifying the target function and selecting items are presented and discussed. More recent developments in test construction using item and test information functions are also described.
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