CINAHL COMPLETE (Ebsco): On the search page in the Limiters section, check the box for Evidence-Based Practice. You can also limit after the search using "Limit To" in Refine Results.
Nursing & Allied Health Source (ProQuest): Under Advanced Search page, find the Search Options section and check the box for Evidence Based Health Care.
Medline or PubMed: Use available limit options such as Clinical Queries, Clinical Trials, Systematic Reviews, Case Reports, Meta- Analysis, or other types of studies.
Although research is often described as a set of "steps," the actual research process usually doesn't fall into clear-cut stages.