An Eenterprise Resource Planning (ERP) software provides an accurate automation system that can reduce operational costs without creating costly shortcuts. In fact a successful ERP project can cut the fat out of operational costs. But in many firms that have adopted ERP (despite success in the implementation phase of the system), this will not be achieved. The successful implementation of an ERP system is just the first step in achieving a successful system and its sustainable advantages depend on continuous support, maintenance and upgrade of the system in the exploitation or post implementation phase. The post implementation phase is exactly where real challenges begin and many dangerous crises are likely to occur. Numerous risks affect the system due to their size, complexity and high chance of failure. Therefore, risks management in ERP post implementation is a critical issue. In order to help practitioners, this paper studies the risks in ERP post implementation phase and the relationship between the risks of post-ERP implementation activities and the reduction of operational costs in an organization (as one of the most important outputs and achievements of an ERP system) is dynamically modeled with Fuzzy Cognitive Maps (FCMS).The main advantage of FCMs is its ability to model complex phenomena based on experts' perceptions. This tool modelling related and uncertain events by imitation of human reasoning. In this paper, 36 risks were identified and collected and categorized into 5 groups of user, technical, managerial, operational and external risks, and their relationships between them and reduction of operational costs were modelled. According to the findings of this study, managerial risks had the most impact on other system risks and output.
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