D.Ed. / The aim of this study is the construction of a model according to -which theoretical educational concepts can be operationalized for purposes of empirical research, with maximal validity. The rationale for the study is that high level terminology in education must continually be established and tested against empirical reali ty for purposes of meta-theoretical justification. Such a model for operationalization must satisfy numerous criteria as well as conditions. An indication is given of the position of operationalization as a methodological step wi thin the broad scope of scientific practice. The following meta-scientific characteristics or conditions are postulated as guidelines for a model for valid operationalization: The external validity and effectiveness of scientific statements; The logical consistency of scientific statements; The informativeness and epistemic truth of statements;...