In my opinion, it go's back to the nature of the project, project's requirements, client's request because of her/his payment condition and many other factors. In other words, the phase structure allows the project to be segmented into logical subsets for ease of management, planning, and control. The number of phases, the need for phases, and the degree of control applied depend on the size, complexity, and potential impact of the project.(PMBOK). According PMBOK, dividing a project into phases happen in initiating process, also in order that, it's project manager who is responsible for project's failure and success, she/he decide how many phases a project should has. Saving Changes...
