Systematic reviews are a type of review that uses repeatable analytical methods to collect secondary data and analyse it. Systematic reviews are a type of evidence synthesis which formulate research questions that are broad or narrow in scope, and identify and synthesize data that directly relate to the systematic review question. Some systematic reviews critically appraise research studies, and synthesize findings qualitatively or quantitatively. For example, systematic reviews of randomized controlled trials are an important way of informing evidence-based medicine ,  and a review of existing studies is often quicker and cheaper than embarking on a new study. While systematic reviews are often applied in the biomedical or healthcare context, they can be used in other areas where an assessment of a precisely defined subject would be helpful.
What is a Systematic Review? - Systematic Reviews - IOE LibGuides at Institute of Education, London
Literature reviews provide a more complete picture of research knowledge than is possible from individual pieces of research. This can be used to: clarify what is known from research, provide new perspectives, build theory, test theory, identify research gaps or inform research agendas. Systematic reviews are a type of literature review. They have a clear, logical rationale that is reported to the reader of the review. They are used in research and policymaking to inform evidence-based decisions and practice.
Systematic Reviews & Other Review Types
Types of articles: A guide for young researchers. Today, young researchers wish to start publishing articles early on in their career. However, they are often unsure of what type of article they wish to write and how to approach this task. This series provides detailed guidance to young researchers about different article types that journals publish and the standard requirements, procedures, and approach to each type.
Reviews of published scientific literature are a valuable resource that can underline best practices in medicine and clarify clinical controversies. Among the various types of reviews, the systematic review of the literature is ranked as the most rigorous since it is a high-level summary of existing evidence focused on answering a precise question. Systematic reviews employ a pre-defined protocol to identify relevant and trustworthy literature. Such reviews can accomplish several critical goals that are not easily achievable with typical empirical studies by allowing identification and discussion of best evidence, contradictory findings, and gaps in the literature.