Nowadays most organizations are seeking for a centralized and integrated system to manage their business functions, to improve internal business processes, to improve the companyâ€™s performance, to improve interactions between internal employs and external organization and to reduce IT and labor costs. Implementing Enterprise Resource Planning (ERP) systems can provide all of the above mentioned benefits by integrating the functions of core business processes like finance, HR, supply chain and inventory management in a single system. There are various types of ERP Systems in the market, such as SAP, Oracle, Microsoft Dynamics, etc. Although this systems have a great advantage the implementation process is complex so it requires an effective and efficient plan. The main objective of this research was to evaluate an implementation process of SAP ERP system. The research aims to find out whether this implementation methodology was effective in achieving its goal. And the specific objective of the research was to identify activities in each implementation phase, to identify challenges in each implementation phase and to identify which phase was the most challenging one and suggest recommendations to prevent or overcome those challenges. The study employed a qualitative approach, a full scope implementation project was choose as a case study, data from the entire process was gathered through observation and document review and semi structured interviews were done. Content analysis and triangulation where used for document analysis. The finding showed that the vendor used ASAP Methodologies, an effective and efficient methodology which was used to implement SAP implementation projects and is divided into 5 vital phases: project preparation, business blueprint, realization, final preparation and go live. The activities in each implementation phase and potential challenges that could cause project time and cost delay were discussed. The researcher concluded that the methodology was effective but the challenges should be considered for any other implementation projects. The researcher recommended to assess or evaluate more implantation project for better understanding