(For the first time, the sixth edition contains guidelines for applying good project management practices in an agile or adaptive environment. Each chapter (or knowledge area) now has four introductory sections: core concepts, trends and emerging practices, tailoring considerations, and considerations in agile or adaptive environments. The sixth edition places great emphasis on the strategic and business knowledge aspects of project management. The first three chapters discuss business documents related to project management. The sixth edition adds a new chapter, which specifically introduces the role of project manager of "PMI talent triangle" And the organizational requirements for the skill set of project managers to make them more competitive and relevant in technology, leadership, strategy and business management.)