standards for writing review articles

studies can be found in two groups of primary and secondary studies. review articles are the most important secondary studies in which the researcher comprehensively surveys published articles in a specific field. however, the deep gap between scientific evidence is an undeniable fact that is probably caused by the large volume of publications. reviewing such a wide variety of publications would definitely be time-consuming.  therefore, a high-quality review article related to a specific question would help improve quality of your research while reducing the amount of time spent. review articles compress a large volume of information to a comprehensible format and thus facilitate the advancement of science. using review article is necessary because of bombardment of information, weak studies, inconsistencies in the results of studies, loss of time and money, losing time and money, and research needs assessment. this review article tried to represent guidelines for types, content, and structure of writing standard review articles. according to the available literature, review articles do not have an organized structure and are non-uniform. researchers are recommended to use an appropriate structure based on the field of their study.