E-Business is the use of the Internet and other networks and information technologies to support electronic commerce, enterprise communications and collaboration, and Web-enabled business processes, both within a networked enterprise, and with its customers and business partners. Particularly, Enterprise e-Business Systems outlines the goals and components of customer relationship management (CRM), enterprise resource planning (ERP), and supply chain management (SCM). The current trend is toward implementation of cross-functional integrated enterprise systems such as ERP, CRM and SCM in business. Answer the following questions.

a. Compare and contrast functional information systems and enterprise information systems.

b. What business values could companies derive from such cross-functional integrated enterprise information systems?