The third part of A.A.Degtyaryov’s article completes the cycle of publications on theory of political decision making (PDM). (For the first two parts of the article, see: Polis, 2003, № 1, 2). In this concluding fragment, the author discloses the content of the organizational-institutional approach, as well as of the models of the political government cycle. The scholar carries out comparative analysis of the PDM models and comes to the conclusion that in the whole of political science it has not, even up to now, turned out possible to create a theory that would be able to embrace, i.e. to reflect in a complex way, all the main systems of societally significant decision making. As the grand total of all the three parts of the article, its concluding part contains a compound table designed to demonstrate the diversity of all the methodological approaches that have been dwelled upon in the article, of their disciplinary sources, of political agents’ functions and dominating motivations.