The book "OPM3 and Organizational Culture" by Carlos Colon Riollano offers a comprehensive analysis of the Organizational Project Management Maturity Model (OPM3), published by the Project Management Institute (PMI) in 2003. It is aimed at professionals in the field of project management and explores how organizations can systematically enhance their project management capabilities. The author highlights the three main components of OPM3: knowledge, assessment, and improvement. Particularly noteworthy is the challenge associated with improvement, as it is closely linked to organizational culture. The book argues that integrating organizational culture into the OPM3 process is crucial for achieving sustainable improvements within the organization. By examining the interactions between OPM3 and organizational culture, the work provides valuable insights for leaders and project managers seeking a holistic approach to project management.