The aim of this paper is to present the results of an analysis of implementing enterprise resource planning (ERP) effectiveness from the perspective of implementation policy and operational effectiveness. Re-engineering has become increasingly important recently due to the rapid changes in the business environment. By implementing ERP systems, companies can standardize their business processes and thereby manage them more effectively and efficiently. However, it is difficult to achieve that kind of effectiveness and efficiency by just implementing ERP. Companies want to know the suitable way to achieve effectiveness. In Japan, ERP systems started to be implemented in the 1990s, and the installation rate to the whole enterprise system is increasing yearly in Japan. However, there are some companies that cannot achieve effectiveness, though some companies have succeeded. The authors developed a model focusing on implementation policy and customization policy, and analyzed the survey results. Data used for the analysis (182 samples) was from the ERP Users’ Survey (2013). For the analysis method, covariance structure analysis using IBM® SPSS® Amos provided by International Business Machines (IBM) Corporation was conducted. This research aimed to contribute to the successful implementation of ERP in Japan.

The paper examines the effectiveness of Enterprise Resource Planning (ERP) systems, focusing on implementation policies and operational efficiency. It highlights that while ERP systems can standardize business processes, achieving efficiency requires more than just implementation. In Japan, ERP adoption has increased since the 1990s, but success rates vary due to company-specific challenges. The authors analyze survey data (182 samples) to identify key success factors, including customization policies and operational strategies. The study finds that business-focused implementation and structured customization policies contribute positively to ERP effectiveness, while excessive customization can reduce benefits. The research aims to provide insights for successful ERP adoption in Japanese companies.