[The "reasonable effort of will" in the expert opinion in social medicine].

The assessment of "effort of will" and "reasonableness" in the social medical expert opinion needs the empirical recording of concrete psychopathological and/or physical symptoms and its connection to fitness for work. The discussion of abstract, philosophical problems is not necessary. From the psychiatric point of view, a proposal for handling these complex terms is presented. The expert assessment should be carried out in several steps.