While many ERP-specific lifecycle models have been described, a widely accepted information systems lifecycle model identifies the phases of initiation, adoption, adaptation, acceptance, routinize, and infusion (Cooper and Zmud 1990).This model can provide a broad framework for the investigation of long-term system maturity and evolution issues. As ERP lifecycle-based research is beginning to reveal, many motivations and factors change over the full lifespan of an enterprise system's existence within an organization. An enterprise system's life spans years and even decades, from ERP selection during the project initiation phase (Kumar et al. 2003), to business process reengineering in the adoption phase (Boudreau and Robey 1996), through the later phases of adaptation, acceptance, routine use, until managers consider whether to optimize or upgrade their ERP system (Khoo and Robey 2007). Markus and Tanis (2000) state that organizations experience problems at all phases of the ERP system lifecycle. Most alarming is that many problems occurring in later phases originated earlier, but were either unnoticed or not corrected. Markus et al. (2000) suggests that researchers employ multiple measures of success that span the system lifecycle and address problem detection, root cause analysis, and early correction. Peslak et al. (2007) also studied preferred ERP use and found that only certain lifecycle phases were influential. What is known is that success in one phase does not guarantee success in later phases. Future research should help organizations determine what they should measure and monitor as key performance indicators throughout the lifecycle of ERP. This will allow the organizations a well-thought-out approach for assessing and managing ERP post-implementation success. Research should also investigate what is needed for an organization to move from a relatively poor ERP implementation to more successful post-implementation stages. Research has indicated that this is possible (Grabski et al. 2009), but has not presented sufficient guidance as to how this should be done.