In this article, The social scientists be particularly aware of and sensitive the way and The procedures by which researchers their work describing explaining and predicting phenomena are called Methodology. The unit begins with definition of research methodology focusing in social and political phenomena.The author begins the chapters with providing the definition of research methodology. he classifies sources of knowledge. Then explains about the characteristic of a scientific approach, and presents the basic assumption underlying the scientific Finally, the author gives the list of answer to prevalent arguments against the possibility of the existence of a social science.