multi-trait multi-method (MTMM) approach

The multi-trait multi-method (MTMM) approach is a way researchers assess the accuracy of measurements by examining different traits (qualities or characteristics) measured through various methods (ways or tools of measurement). For example, evaluating personality traits using questionnaires and interviews. By comparing results across traits and methods, researchers can determine if their measurements truly reflect the traits they intend to assess, rather than being influenced by the measurement method itself. This approach helps ensure that findings are valid and reliable, distinguishing true differences in traits from potential biases or errors introduced by the measurement tools.