»The Assertiveness of Interest Groups of People with Disabilities. Process Tracing of the >Bundesteilhabegesetz<�«: As part of the coalition agreement in 2013, it was agreed to create a new law for people with disabilities, the so-called Federal Participation Act (Bundesteilhabegesetz). In the dissertation it was assumed, that weak interests could exert influence on political decision-making situations. Under these circumstances causal mechanisms could be identified particularly well, regarding the use of power resources of weak interests. A range of support of different actors, the common goal of implementing the UN-CRPD and the use of different power resources led to assert some of the weak interests' demands.