A protocol is a detailed plan to help guide the review project. If completed thoroughly, completion of a protocol will facilitate a more efficient and successful project. A protocol is recommended for any type of review, but is especially encouraged for systematic reviews, meta-analyses, scoping reviews, or umbrella reviews. Protocols are required for Cochrane projects.
Some journals are regularly publishing protocols for multiple review types. Because it is expected that more journals will adopt this practice, please use the below list only as a starting point.
In addition to the below list, consider a journal specific to the review subject, and send an inquiry to the journal if no information is available on the journal webpage.