The review protocol sets out the rationale and methods to be used in the review and provides a plan for your work.
The protocol should include:
Consider registering your protocol. Registration helps to promote transparency in the review process and also reduces the potential for duplication.
Many journals require SRs to have registered protocols PRIOR to beginning the screening stage. Check the author guidelines section of prospective journals.
Use PROSPERO to register systematic review protocols. Note: they will not accept protocols for most other review types.
Open Science Framework accepts Systematic review protocols and other review protocols including scoping, integrative, and rapid.