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The chapter explores the Open Information Systems Management Maturity Model (O-ISM3) framework, crafted by The Open Group to evaluate and refine the maturity of enterprise architectures, with a keen focus on information security management. Originating from the demand for a dedicated model for proficient management of information security processes, what sets O-ISM3 apart is its versatile nature, making it suitable for diverse organizations, irrespective of their scale or sector. The text navigates through its inception, its core principle of continuous improvement, and the importance of the holistic approach to security it promotes. With a structure encompassing security processes, maturity levels, metrics, and more, O-ISM3 offers a comprehensive overview of information security management. It not only lists the benefits of the model but also suggests best practices for its effective implementation, emphasizing the importance of clear objectives, leadership buy-in, phased approaches, and consistent communication among other key strategies. Dive into this document to explore the intricate structure, components, and vast benefits of O-ISM3, along with best practices for its effective implementation.