Evidence-based medicine is
the "conscientious, explicit and judicious use
of current best evidence in making decisions
about the care of individual patients".
Sackett, D. L., Rosenberg, W. M., Gray, J. A., Haynes, R. B., & Richardson, W. S. (1996). Evidence based medicine: What it is and what it isn’t. BMJ : British Medical Journal, 312(7023), 71–72. Click on link to see the full article Evidence Based Medicine.