Brad Bigelow, an author of PRINCE2 V7, discusses the relationship between PRINCE2 and the PMI’s PMBOK (Project Management Body of Knowledge), emphasizing that they are often mistakenly seen as competing disciplines. He clarifies that PRINCE2 is a well-established methodology, refined through thousands of projects, and provides a structured approach to project management. It is particularly beneficial for organizations that handle multiple projects, offering a comprehensive framework that can be adapted and tailored to specific organizational needs.

Bigelow highlights the practicality of PRINCE2, noting that it comes with defined roles, scoped documents, and clearly explained processes. This "out-of-the-box" aspect of PRINCE2 makes it a valuable resource for organizations looking to establish a solid project management methodology without having to develop an entire system from scratch.

In contrast, the PMBOK is described as a collection of knowledge and best practices that have proven effective in various projects. Unlike PRINCE2, PMBOK is not prescriptive but offers a range of methodologies and ideas that can be applied as needed.

Bigelow suggests that PMI members and organizations without an in-house project management methodology should consider PRINCE2 as a resource. It offers a wealth of useful, structured information that can significantly benefit project management practices, especially for organizations involved in numerous projects. The key takeaway is that PRINCE2 offers a comprehensive, adaptable framework suitable for various organizational contexts, streamlining the project management process.