The main purpose of this study is to better understand how the post merger integration contributes to a successful merger or acquisition transaction. This study attempts to find out why the numbers of failures in M&A are so high. This study used data from two sources, primary and secondary data. The primary data was collected by in depth interviews. In fact, two interviews were done to achieve valuable information. Secondary data was collected from different sources such as libraries, journal articles, books, catalogues, textbooks and Internet. To consult more Economic essay sample, please see at Bộ Luận Văn Thạc Sĩ Kinh tế. | Master Thesis in Economics: Post-Merger Integration Achieving Success in M&A