Enterprises are investing a great amount to utilize information systems. These investments are expected to increase worker productivity and thus bring forth a considerable amount of profit to the enterprise. Given this situation, there are many studies being conducted on the relation between IT investment and an increase in individual productivity. This study deals with more general enterprise information systems, and has the objective of developing a model to assess the user's utilization of the enterprise information systems. Using the User competency evaluation model as the basis, the assessment model uses User's EIS basic knowledge, general application, master application, personality as the measurement areas, and utilizes a different measurement method for the different categories taking into account the characteristics of each category. Also, in order to test the validity and credibility of the assessment model, we applied a case among approximately 18,000 female employees of Korea's representative automobile companies. As a result, all of the measured categories with the exception of User's EIS Personality were proven to be valid and credible. The User's EIS Personality is an index that is more prone to be affected by the individual characteristics of the user, and thus requires further research.