Introduction: Emergency Department Systems Transformation (EDST) is a bundle of Toyota Production System based interventions partially implemented in two Canadian tertiary care Emergency Departments (ED) between June 2014- July 2016 with the goal to improve patient care by increasing value and reducing waste. Some of the 17 primary interventions included computerized physician order entry optimization, staff schedule realignment, physician scorecards and a novel initial assessment process. Some interventions have only been partially implemented due to persistent access block. This project was designed to examine the effect of partial EDST implementation on patient experience of emergency department visits. Patient satisfaction has been linked to improved patient outcomes, improved adherence to physician instruction, and improved provider satisfaction. Methods: Semi structured interviews were conducted over three distinct time periods (summer 2015, 2016 and 2017) to encompass progressive levels of EDST implementation. The interviews focused on the patients perceptions in each of 4 stages of their ED visit - Check-in, assessment, reassessment, and disposition. Patients were asked a list of positive (respected, listened to, supported, safe) and negative (in pain, worried, confused, frustrated) emotions frequently experienced and asked if they felt any of these emotions during their ED stay. Open ended questions were also asked about their overall visit. Descriptive statistics were calculated as differences in the proportion of patients feeling each emotion across timeframes. The open-ended question was coded by two reviewers as positive, negative or mixed. A kappa score was calculated to determine reviewer agreement. Results: 987 interviews were completed. In general, the proportion of patients feeling negative emotions remained consistent while positive emotions increased as EDST implementation progressed. For open-ended responses, the percentage of overtly positive experiences increased significantly from 2015 to 2017 (p=0.006), while overtly negative experiences did not significantly change. Reviewers agreed in the coding of the open-ended responses in 97.6% of surveys. The kappa score for reviewer agreement was 0.96 (95%CI 0.94-0.98) indicating almost perfect agreement. Conclusion: Partial implementation of EDST positively impacted patients experience of emergency department visits.