In chapter 1 we ask the question: How can we develop a general scientific methodology, on tenets from Mario Bunges philosophy? The purpose is presenting a general scientific methodology on tenets from Mario Bunge´s philosophy. In the end of the chapter we show a general scientific methodology. based on systemic thinking. In chapter 2 we work with some of Mario Bunges statements, for instance: In order to explain a phenomenon/problem, some of the mechanisms which elicit the phenomenon/problem must be clarified, since: "a goal of scientific research is to uncover reality beneath appearance" (Bunge, 1998:149). The issue to be investigated by us is as follows: How can social mechanisms be examined from at systemic point of view? We will investigate, at an abstract level, what is meant by social mechanisms in social systems. Then we will investigate social mechanisms and various explanation models. In chapter 3 we discusses complexity in communication. We ask the question: How can one use distinction in the process of communication to reduse complexity? This perspective on communication is based partly on Bunges philosophy, and partly on Systems Theory. The purpose is to improve the theoretical understanding of the communicative processes. Through the chapter we develop aspects of a communication theory with three assumptions and ten propositions.