Original Research/Empirical Article
An article that reports on original research, such as an experiment, or analysis of data, a creative work, phenomena, or historical event.
Review Article
An article summarizing the results of many original articles investigating similar topics. May use analytic techniques such meta-analysis to statistically compare data from multiple studies.
Theoretical Article
An article intended to contribute to the theoretical foundations of a field, providing explanations for phenomena and frameworks that can be used to guide the analysis of evidence.