It helps the reader quickly understand what is being presented in the review article.
Evidence mapping is a process by which researchers select and reject studies related to the research question at hand.
Authors and reviewers look for potential bias and misuse of data (or observation) in every area of the study.
The results of different studies are compared and contrasted, using the research question as a guide.
Criteria must be established at the outset for what constitutes a relevant study and what does not.
In their article entitled, “The Global Evidence Mapping Initiative: Scoping research in broad topic areas,” authors Peter Bragge, et al (2011) describe evidence mapping in this way: “Evidence mapping describes the quantity, design and characteristics of research in broad topic areas….
Research questions are often devised with the use of the PICO structure: Population, Intervention (or Exposure), Control/Comparator, Outcomes.
The question will serve as a reference point throughout the research and discussion, so it needs to be explicit.
It is the standard for quality and legitimate academic review articles.
Academics recognize that, for a study to be reviewed and published, it must follow certain universally-agreed guidelines.