Evidence Based Practice is the integration of clinical expertise, patient values and the best available evidence into the decision making process for patient care.
(Sackett, D.L., et al. (2000). Evidence-based medicine: How to practice and teach EBM (2nd ed.). Edinburgh: Churchill Livingstone).
6S Hierarchy of Evidence
"When using this model to guide clinical decision making, begin your search at the highest possible layer in the 6S model" DiCenso, A,, Bayley, L., & Haynes, R.B. 2009. Accessing pre-appraised evidence
Hierarchy of Studies adapted from Duke University Medical Center Library