The approach of the authors to develop an action theoretical effects model and the following empirical surveys based on it (since 1997) show within the context of the “long-term-care insurance” act (SGB XI) for the home-care sector, in which ways legal effects can be created and how to evaluate these effects with respect to the effectiveness of the law. It becomes evident that a choice of services is directly accepted and increasingly has the effect of providing the necessary support, but does not make a direct control established in law possible, while real life principles and understanding of care seem to be relatively stable and are not influenced by care standards introduced by legislation. Furthermore, the behaviour of the act’s addressees makes the conflicting aims of legislation clear. So the aim of legislation to support an independent, autonomous way of life for the persons who need care contradicts the fact of living with their families and relatives and consequently leads to an increasing number of people in singleperson households who mainly use professional nursing care services. As a final result the law with its interdependencies to social developmental dynamics that are partly favoured, partly also stopped, does not have, though, the intended effect with respect to the aim of prioritization of home-care by relatives or friends to in-patient care.