What is project lifecycle?

​The life cycle of the project determines the diversity of situations occurring during its implementation. One of the first tasks of the project manager is to define the scope of work to be done and to divide tasks between members of the project team.
Defining tasks is the first stage of the project manager's work throughout the entire life cycle of the project. At this stage, the customer specifies the requirements and the project manager agrees on the most important aspects of the project. Regardless of the form in which the requirements are agreed upon, the five basic questions must be answered in the definition phase:

• What problem does the project involve?
• What is the purpose of the project?
• What sub-goals must be implemented to achieve the primary goal?
• How do we assess whether the project has been successful?
• Are there any predictions, risks or potential obstacles that can affect the success of the project?

These, along with the scope of the project, shall be the main pillars of Business Case.
Project Business Case
Business case it the main document needed in order to document the value of the project and make sure everyone is on the same page in terms of scope and deliverables. Since business case is a base for the project development, it can become a great tool to look up to and check whether the team is on track with what was initially intended.
Project Business Case, if done correctly, can be sufficient to start a project. Good PCD contains information on:

• General goal of the project
• Value provided for the company
• Time and scope
• Resources required
• Proposed solution
• Team and roles
• Main stakeholders
• Information on sponsor

All of which are covered in the supplementary materials PCD. With internal projects, I believe a good addition would be to add the success criteria mentioned before. For technical projects, it could go with a definition of “done”. Being on the same page in terms of how we evaluate the efforts and results is crucial to objectively measure the project.
In terms of the “Why”, nothing explains it better than numbers and results predictions. The Project Measurement Framework presented in the supplementary material doesn’t specify the exact way of weighting and selection criteria. Clarifying that point may be crucial to really get into why a project is being run and make sure it is treated with required seriousness and prioritization within the organization.