The integrated innovation maturity model (I²MM) was developed to evaluate innovation capabilities of companies using their innovation process and its flexibility towards changes of markets and the company’s business environment. Innovation processes have different impacts on projects through all phases of value creation. Based on the requirements engineering integrated innovation process (REI²P) that highlights the early phases and underlines the importance of systematically integrating customer requirements into the innovation process, the I²MM is structured into four process areas: (1) ideation and product development, (2) innovation management, (3) requirements engineering, and (4) quality management. I²MM is a lean approach that fosters quality of systematic innovations and can perfectly be adjusted to meet the needs of large corporations and small and medium sized enterprises (SME) as well. I²MM was developed by the authors at Pumacy Technologies AG within the joint research project ISPYROM, funded by the German Federal Ministry for Education and Research (BMBF).