Class of 2017 Abstract / Objectives: To evaluate the perceptions of the pharmacy staff on prescription errors, efficiency, and difficulty of use before and after implementation of a new pharmacy computer system. Subjects: Employees of El Rio Community Health Center outpatient pharmacies located at the Congress, Northwest, and El Pueblo Clinics. Methods: This study was of a retrospective pre-post design. A 5-question survey on error rates and workflow efficiency was distributed to pharmacists and technicians 6 months after a new computer system had been implemented. Participants of the study included employees of El Rio Community Health Center outpatient pharmacies who were employed with El Rio during the time of transition between the old and new computer systems. Results: Questionnaire responses were completed by 10 (41.7%) technicians and 6 (66.7%) pharmacists at three El Rio Clinics. There was an increase in perceived efficiency between the new (Liberty) (n=17, 94.4%) and old (QS1) (n=11, 61.1%) computer systems (p<0.05). There were no significant differences in perceived difficulty of use, most common types of errors, error rates, and time to fix detected errors. Conclusions: While there were no significant differences between Liberty and QS1 in perceived difficulty of use, most common types of errors, error rates, and time to correct detected errors, there was a significant difference in the perceived efficiency, which may have beneficial implications.