Organizational learning has been a focus of scholars since 1970. Researchers have demonstrated that conducting postproject reviews to capture lessons learned significantly improves organizational learning. Guided by the concept of organizational learning, the purpose of this case study was to explore how 6 New York metropolitan organizational leaders used postproject reviews to prevent project managers from repeating the same mistakes, increasing cost and time overruns, and experiencing project failure. Semistructured face-to-face and phone interviews were conducted with a project sponsor and 5 project managers in the New York metropolitan area. Data were analyzed using the process of coding and condensing the codes, which produced 5 themes, including effective lessons learned, capturing lessons learned, benefits of lessons learned, barriers to postproject reviews, and leadership support. The findings of this study indicated that organizational leaders used standard templates and organizational policies to ensure project managers execute postproject reviews. Organizational leaders and project managers may benefit from the findings of this study by learning the advantages of conducting postproject reviews. This study may contribute to positive social change by organizations achieving cost avoidance when they reduce project failures and increase project success.