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The selection of a software development methodology is vital activity in any software project. It has a great impact on customer satisfaction and business welfare. Normally the selection is based on experience or in some cases a rational. This paper provides an overview of the agile methods, and describes comparative studies where analysis and comparison of methodologies has been carried out. Then a comparative study is described which was carried out on five agile methods in order to address the question ‘what is an agile method’? The objective to this paper to describe the five agile methods: SSM , DSDM ,Lean , Merise and Euromethod Methods. The results provide an analysis of the properties common to agile methods, the differences between the methods, the unique properties peculiar to agile methods, and provide an understanding of appropriate method combinations.