This article gives a didactic introduction to the analysis of multitrait-multimethod data with models of
multilevel confirmatory factor analysis. In particular, the principles of the multilevel CT-C(M-1) model
for interchangeable and structural different methods are explained in detail, and the first application
of this model to more than two structurally different methods is presented. The model is illustrated by
an application to the analysis of the convergent and discriminant validity of the trait subscales of the
State-Trait Cheerfulness Inventory (STCI-T, Ruch, Köhler, & van Thriel, 1996). The results show that the
STCI is a reliable and valid questionnaire for assessing the temperamental basis of sense of humor.