A systematic review is a type of evidence synthesis.
Systematic reviews are among the more rigorous forms of evidence synthesis. In general, they:
Answer one (or more) carefully constructed question(s)
Are carried out by a team of librarians, methodologists, statisticians, subject matter experts and stakeholders
Use a clear, transparent and rigorous protocol for selecting, evaluating and extracting evidence
Consider the role of subjectivity and bias in their results
Involve stakeholders in the process