Specialists in the philosophy of social sciences preach simplicity in choosing variables during research design, the aim of which is to avoid the complexity of abundance, reducing the clarity and logical consistency of the thesis. The rule of using limited variables is based on the methodological rule called the "Principle of Parsimony" which means that the most acceptable explanation is the simplest and stipulates the use of the lowest possible number of variables in order to explain the maximum possible number of phenomena. This study introduces this principle and examines the reasons for its absence from political research by assuming that the reason for the lack of parsimony in political research, and the tendency of researchers to use multiple variables, is the widespread "methodologist" tendency, which emerges as a type of excessive confidence in the reliability of the method.