Na quarta parte da sétima edição do livro de engenharia de software do Pressman, no capítulo 24, que trata dos conceitos de gerenciamento de projetos, temos:
"Effective software project management focuses on the four P’s: people, product, process, and project. The order is not arbitrary. The manager who forgets that software engineering work is an intensely human endeavor will never have success in project management. A manager who fails to encourage comprehensive stakeholder communication early in the evolution of a product risks building an elegant solution for the wrong problem. The manager who pays little attention to the process runs the risk of inserting competent technical methods and tools into a vacuum. The manager who embarks without a solid project plan jeopardizes the success of the project."