This report discusses the three Enterprise Resource Planning systems: On-premise, Hosted and Cloud ERP systems. It explains the topics on each one of them, the associated benefits, risks and some of the challenges they face in cases where companies may opt to use them. The report also includes a comparison and contrast between the three systems in terms of cost, security, scalability and deployment, and user access. Case studies of Cadbury and Hershey's companies are also included.