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American Psychological Association. (n.d.). Evidenced-based practice in psychology. American Psychological Association (APA).
While this policy relates primary to work done by clinicians, the principles can be applied to all programs and practices aimed to intervene in, or prevent, a problem in the broad area of mental health.

The Oregon Addictions and Mental Health Department has developed criteria for evaluating research on interventions. Study their position paper, and the accompanying chart to gain an overall understanding of EBPs and how to evaluate them.
In this PDF document from the Oregon Addictions and Mental Health Department covers the operation definition for evidence based practices.

Tanenbaum, S.J. (2005). Evidence-based practice as mental health policy: Three controversies and a caveat.
While this policy relates primarily to work done by clinicians, the principles can be applied to all programs and practices aimed to intervene in or prevent a problem in the broad area of mental health.