This study evaluated the adoption of electronic medical record (EMR)-based information systems in three public hospitals in Korea that were introduced in July 2012. Surveys of doctors and nurses before and after implementation found increasing intention to use and perceived benefits around reduced medication errors over time. However, barriers like technical capabilities, lack of organizational support, and time requirements initially hindered adoption. The study aims to provide insights to improve EMR system quality and implementation processes based on Rogers' diffusion theory and DeLone and McLean's IS success model.