Synopses of Single Studies
DiCenso, A., Bayley, L., & Haynes, B. (2009). Accessing pre-appraised evidence: fine tuning the 5S model into a 6S model. Evidence-Based Nursing, 12(4), 99-101.
Depending on the type of question you are asking, the best evidence to answer your question will be different- see PICO concept map for types of questions and best evidence to answer them.