Hybrid P3M, processes in optimized, mature environments, is an advanced technical book for hybrid project and program management. It is a complete methodology covering both processes as well as principles, according to a sound meta-model. Essentially, it combines the benefits of predictive and agile delivery and it aligns with the Projects with Learning Outcomes (ProwLO) methodology introduced in Knowledge Management for Project Excellence, by Lukasz Rosinski. It also aligns with the PRINCE2 method, and provides an alternative for PRINCE2-Agile, combining traditional control and flexible agile traditions. It is a holistic method, addressing Project, Program, Portfolio Management (P3M) interfaces and topics such as leadership.Based on HybridP3M's process model, derived from common enterprise project functions (such as project planning) functional achievement is recommended and feasible. Each HybridP3M process is analyzed according to unique process aspects. Furthermore, a new maturity framework is introduced called MAIDEO. At the end of every process Chapter requirements are provided for different maturity levels. The specific benefits of the HybridP3M methodology include: eases the burden on project managers thanks to joint process responsibility; controlled environments thanks to traditional management; change responsive agile delivery process; pathway to optimized and mature organizations, functional P3M achievement thanks to functional processes.