This paper builds on the work of Young and Jordan (2008) and Poon et al. (2011) to provide stronger empirical evidence that TMS is the most important factor for project success. It adds to the evidence that current practice emphasizing project methodologies may be misdirecting effort. The contribution of this research may be to provide enough evidence to influence top managers and practitioners to re-evaluate the conventional wisdom of the past 40-50 years. Researchers and practitioners, using the fuzzy-set analytical approach are introduced to a method to compare all their project experiences and determine conclusively the most important critical success factors for project success. There are significant implications for board, senior management and project management practice and academia.