MPM library research assignment

Write 300-400 words that respond to the following question  

Be substantive and clear, and use examples to reinforce your ideas.
Research the project management process groups and the project life cycle structure in the PMBOK® Guide, then respond to the following: 

• When starting a project, why would a project charter, as described in the PMBOK® GuideDevelop Project Charter Process of the Initiating Process Group, be important? 
• What is the purpose of the scope statement produced during the Define Scope process of planning the project? 
• Explain how the project management process groups are similar to, yet different from, the project life cycle structure.