The rising expenses of information systems and their growing importance to organizations have made the justification of projects increasingly critical. The justification is usually done through a business case that is an initial step for organizations approaching an ERP implementation. The issue of developing a business case and using it during ERP implementations successfully is challenging and under-researched. This paper is a literature review on business cases in ERP, we try to identify the research issues that need to be addressed in this area and give some guidelines to developing a business case for ERP implementation.