While the definitions do vary somewhat depending on the area of application, all definitions refer to the use of scientific research as a way to inform service delivery, or programming or policy. The Substance Abuse and Mental Health Services Administration (SAMHSA), a division of the US Department of Health and Human Services, answers the question: What is evidence-based? as follows:

 

In the health care field, evidence-based practice (or practices), also called EBP or EBPs, generally refers to approaches to prevention or treatment that are validated by some form of documented scientific evidence.” ….. “Evidence-based practice stands in contrast to approaches that are based on tradition, convention, belief, or anecdotal evidence.” (SAMHSA, What is Evidence Based?)