Can someone please answer this question for me???

Can someone please answer this question for me???

Explain the Plan, Build, Manage (PBM) phased approach of the Cisco® network design lifecycle.

Include the following:

• Identification and description of each phase
• The significance of each phase in the overall functioning of the network
• Example of how not completing the phase properly can affect the design outcome
• The benefit of this approach to Cisco's historical six-step network lifecycle