CINAHL defines peer review to include the following below. Generally speaking, peer reviewed means that there has been some degree of peer review process for the publication.
- Blind peer review (when either the reviewer or the author does not know the identity of the other)
- Double-blind peer review (when neither the author nor the reviewer knows the identity of the other)
- Expert peer review (when journal articles are reviewed by selected experts in that field)
- Editorial board peer review (when journal articles are reviewed by the editorial board)
CINAHL may also consider the title peer-reviewed if the title is viewed as such by the publisher.