Research paper: The regular research papers contain new research findings in respective fields.  Null and negative findings and reanalysis of previous studies leading to new results and confirmatory results are also encouraged. The results of the regular research papers have a general impact and contribute to the advancement of the particular field.

Review paper: Review articles provide critical and constructive analysis of existing published literature in a field through summary, analysis, and comparison, often identifying specific gaps or problems and providing recommendations for future research.

Special issue: A special issue is a collection of articles that concentrates on a topical research area within the scope of the journal. Special issues provide a venue for research on emerging areas, highlight important sub-disciplines, or describe new cross-disciplinary applications.