The implementation of ERP projects is a specific case of information system projects that require modifying pre-produced software according to the condition specified for an organization to fulfill particular benefits. ERP systems adoption is a complicated, lengthy, risky, and costly process for all sizes of organizations that usually faces critical failures and challenges. Especially for SMEs with limited capabilities and resources, they lack the experience of requirement specification and ERP implementation. This failure could be costly and may cause corporate bankruptcy. This study proposes a Risk Diagnosing Methodology for implementing ERP projects in SMEs (RDMERP). The proposed methodology is systematic and a global road to proactively identify, assess, analyze, and treat the various risks associated with any ERP implementation through all the phases for protecting the SMEs’ assets and mission and meeting the ERP project objectives.