Most researchers agree that psychological/educational tests are sensitive to multiple traits, implying the need for a multidimensional item response theory (MIRT). One limitation of applying a MIRT in practice is the difficulty in establishing equivalent scales of multiple traits. In this study, a new MIRT linking method was proposed and evaluated…

Three multitrait-multimethod studies are described, which indicated that ill-defined solutions were frequent, and alternative parameterizations tended only to mask this problem. Moreover, method factors sometimes represented trait variance as opposed to method variance. However, specification of method effects as correlated uniqueness proved more…

A mixed-method conceptual framework was developed from the literature and refined through an analysis of 57 empirical mixed-method evaluations. Five purposes for mixed-method evaluation are identified (triangulation, complementarity, development, initiation, and expansion) and analyzed using the framework of 7 design characteristics. (TJH)