Mahsa Assadi - Ershad Institute of Higher Education, Tehran, Iran
Mohammad Amin Mozaheb - Imam Sadig University, Tehran, Iran

This is a corpus-based investigation on interactional metadiscourse markers containing hedges, boosters, selfmentions,attitude markers and engagement markers in the discussion and the conclusion sections of 120 Englishresearch articles of hard and soft disciplines including chemistry, medicine, economic psychology and tourismmanagement. The corpus was comprised of 160344 words. The selected corpus was analyzed using Hyland’s (2005)model of interactional markers. This study employed quantitative approach, including frequency counts and textanalysis. Several chi-square tests were carried out to clarify the probable differences. The results indicated that therewas no statistically significant difference between hard and soft sciences papers in the application of markers in thediscussion and the conclusion sections. The findings indicated that the use of interactional elements differed in fourmajors. The most used markers were in the tourism management corpus and the least ones were in the chemistrycorpus. Furthermore, the discussions and the conclusions sections in every majors differed in terms of metadiscoursemarkers. In the whole corpus, the frequency of markers in the conclusion sections were higher than the frequency ofmarkers in the discussion sections. The study rendered some pedagogical implications.

Discussion and Conclusion Sections, Hard Disciplines, Interactional Markers, Research Articles, Soft Disciplines