Developing a protocol (plan) for a systematic review outlines the individual processes that need to be undertaken within the review. The first part of this process is formulating a question.
There are several available frameworks for developing including:
You should choose the appropriate tool for your type of question.
Once you've formulated your question, you will need to start developing a protocol to guide the conduct of your review. This will cover inclusion/exclusion criteria, screening methods, risk of bias and data analysis.
It is good practice to prospectively register your protocol and in many cases a requirement for future publication of the review.
Places where you can register your protocol: