Enterprise resource planning (ERP) systems are a growing area of research in business information systems. The primary purpose of this research is to review the literature on ERP implementation and to present results of a case study on ERP implementation. An exploratory case study was conducted to study these research issues. The case study consisted of a survey and interview of 25 employees at one organization. The results provide data analysis findings from the survey and qualitative findings from the interview. Using this case study, the chapter indicates the presence of four phases in ERP implementation through the support from qualitative interviews. Using t-tests, the results confirm the presence of a positive feeling of users toward the four ERP implementation phases.