The question as to which structural equation model should be selected when multitrait-multimethod (MTMM) data are analyzed is of interest to many researchers. In the past, attempts to find a well-fitting model have often been data-driven and highly arbitrary. In the present article, the authors argue that the measurement design (type of methods…

Quality assurance and evaluation research, like other fields of social research and its application, are confronted with a series of problems. In the present paper, I want first to give a list of such problems, although necessarily incomplete. It is then claimed that while there is no "perfect" solution to these problems, critical multiplism may…