MTMMdesign
MTMMdesign refers to the multi-trait multi-method design, a framework used in psychometrics to evaluate the validity of measurement instruments by examining how multiple constructs are assessed with multiple measurement approaches. The concept, introduced by Campbell and Fiske in 1959, aims to distinguish trait variance from method variance and to provide evidence of construct validity for a set of measures.
In a fully crossed MTMM design, researchers select several traits (constructs) and several methods (measurement approaches),
Analyses can be descriptive, via inspection of the MTMM matrix, or formal, using MTMM confirmatory factor analysis.
Limitations include design complexity, substantial data requirements, and interpretation challenges when methods or traits are not