ERP system

After reading chapter 8
art A:  Identify the supply chain management, customer relationship management, or e-procurement services that are used by  PricewaterhouseCoopers or  Federal Express.
Under what circumstances might a company want to use these services?
Write a two- to the three-page paper explaining the circumstances.
Part B: If you were implementing an ERP system, in which cases would you be more inclined to modify the ERP to match your business processes?
What are the drawbacks of doing this? Which ERP is the best?
Perform some original research and compare three leading ERP systems to each other.
Write a two to a three-page article comparing your characteristics.