For more information on Motivational Interviewing (MI), here’s the link to the Motivational Interviewing Network of Trainers (MINT) which includes the founders William R. Miller, Ph.D. and Stephen Rollnick, Ph.D.
To find out whether a therapeutic practice is evidenced-based, you can look it up on the NREPP – SAMSHA’s National Registry of Evidenced-based Programs and Practices: http://www.nrepp.samhsa.gov
MI as an evidenced-based practice: http://www.nrepp.samhsa.gov/SearchResultsNew.aspx?s=b&q=Motivational%20Interviewing
Mindfulness practices are also evidenced-based: http://www.nrepp.samhsa.gov/SearchResultsNew.aspx?s=b&q=Mindfulness
Clinical studies have documented the physical and mental health benefits of mindfulness in general, and MBSR (Mindfulness Based Stress Reduction) in particular. Programs based on MBSR and similar models have been widely adapted in schools, prisons, hospitals, veterans centers, and other environments.This is a study specifically on the efficacy of MBSR: http://www.nrepp.samhsa.gov/ViewIntervention.aspx?id=238
For information on the Wellness Recovery Action Plan (WRAP): http://mentalhealthrecovery.com/wrap-is/
WRAP is also an evidenced-based practice.
For those interested in Mindfulness practices for Teens: http://mindfulnessforteens.com
For the Society of Clinical Psychology: http://www.div12.org