Information for the Maryland Behavioral Health Administration’s (BHA) Outcomes Measurement System (OMS) is gathered from individuals who are receiving outpatient treatment services in the Public Behavioral Health System (PBHS). The data is collected over time across various life domains. Following a pilot phase, the OMS was implemented in 2006 with a recognized need for ongoing efforts to maintain and refine it. Over the years, refinements were used to address challenges in evaluation methods and data interpretation. This poster describes OMS modifications that were made in order to generate more useful and effective data. The context of the modifications will be discussed in detail and show how data analysis, stakeholder feedback, and practical considerations can shape outcome measures used in the evaluation of behavioral health services.#system #mentalhealth #Outcomes #mentalhealthservices #2015Conference #Measurement