Access logs for electronic medical records (EMRs) are a useful source of data for understanding how nurses' perform their duties. The purpose of this study was to understand how nurses' used an EMR system, by inspecting and analyzing from one week EMR access logs (394,708) of accessing 'outcome Input' screen. Anytime day and night, nurses accessed 'outcome Input' screen. Viewing and information input obtained from observations, in order to monitor patients' conditions over tasks such as keeping nursing records.