Complex, high-level customization products are usually produced in an environment known as Project Manufacturing, where each product is executed through a specific project that must meet defined goals of scope, cost, time and quality, which is known as "iron triangle". The performance of these projects can be influenced by elements known as Critical Success Factors (CSFs) that are widely discussed in the scientific literature without, however, having a consensus on their influence on the cited environment. Thus, this study aims to analyze the influence of CSFs on the chance of reaching the goals established for the projects in the "iron triangle". The results show that despite exists many factors, just a few are statistically significant to explain this phenomenon: team integration, clear objectives, record lessons learned, use previous technologies, insert time and money reserves, and project risks identification.