The selection of the most adapted project management method (PMM) can contribute to the success of information technology (IT) projects and hence the company's optimized profitability and operability. Due to many PMMs known for their operational advantages, and with the variety of companies’ strategies and policies, the decision‐making process of selecting the best‐suited PMM can get cumbersome, and some unfounded practices could, consequently, mislead its involved leaders. We propose in this work a methodological approach of decision analysis that allows a structured, reproducible, and group decision support system‐assisted execution. The methodology was fully executed and evaluated with three real case studies of IT projects, and further improvements and research perspectives were identified.