Network design management describes a process with specific steps and a sequence for those activities. As mentioned it is an engineering life cycle that supports technical initiatives such as Windows migration, IP telephony, and wireless design to name a few examples. The methodology begins with examining company business requirements. It is absolutely essential that you understand the company's business model, business drivers, and how they are growing from a business perspective. That will build the foundation for a design proposal that serves the business, technical and operational requirements of the company.