How do I answer Part A and Part B?

Part A Question: Four steps to help companies to swiftly get onto the road to service supply chain excellence are listed below: 1. Understand your service supply chain. 2. Determine the needs of your customers and convey those needs down the supply chain. 3. Obtain high quality suppliers. 4. Maintain a competitive advantage. As Wal-Mart is expanding its online presence, how would you implement the above four steps in order for Wal-Mart to become a leader in ecommerce marketplace and effectively compete with such online retailers as Amazon? Explain each step with one paragraph. Part B Question: One of the common difficulties in project management is to fulfill the triple constraint. Part A of this homework is an analysis of Wal-Mart online expansion. If you were hired by Wal-Mart as project manager to build and maintain its ecommerce marketplace, what challenges would you be faced with in trying to fulfill the triple constraint while doing your job? State the challenges and explain how you would address each of those challenges.