Multi Criteria Decision Making methods have been used in decision making with various disciplines since 1960. PROMETHEE method, one of the discipline of French school, have excelled among the other MCDM methods since 1980. The purpose of this article is to introduce PROMETHEE method and to emphasize the advantages of PROMETHEE method and its geometric representation GAIA plane to the decision maker which have been commonly used in academic studies in recent years. GAIA plane is built on the results of PROMETHEE method and it offers a visual representation to the decision maker. This visual representation provides benefits to PROMETHEE among other MCDM methods. In this article, GAIA plane’s properties, notations, alternatives, criteria and decision stick positions on the plane are described to guide for researchers