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The PMBOK only represents a part of the expertise required to manage projects effectively. Other areas of expertise are necessary to allow a management team to apply the knowledge in the PMBOK and manage one or more projects. The PMBOK specifically focuses on managing single projects. Because most organizations need to manage multiple simultaneous projects, the need exists for management expertise beyond what the PMBOK addresses. Although other areas of knowledge and expertise are beyond the scope of the PMP exam, you will likely be asked a few questions that test your general awareness of other management requirements.
In addition to the PMBOK and an understanding of the project environment, there are at least three additional areas of expertise necessary to manage a project well. They include