The present study investigated and compared the effectiveness of uni-thematic and multi-thematic classroom discussions on Iranian EFL learners’ vocabulary achievement. Through a quasi-experimental design, 60 intermediate EFL learners were selected based on a convenience sampling procedure and the Oxford Placement Test (OPT) results from intact groups in a private language institute in Tehran. They were divided into two experimental groups: the uni-thematic discussion group (UTDG, N=30) and the multi-thematic discussion group (MTDG, N=30). Then, pre and post teacher-made vocabulary tests were administered. The data were analyzed using descriptive statistics, paired sample t-tests, and independent-sample t-test analyses. The findings showed that both uni-thematic and multi-thematic classroom discussions can significantly develop vocabulary knowledge. The theoretical implications of the findings lay in the fact that the effectiveness of classroom discussions in enhancing vocabulary knowledge is not dependent on the specific approach, whether it is multi-thematic or uni-thematic discussion. Curriculum designers, decision makers, and teachers are hoped to benefit from the results to update the curricula and integrate more oral activities into the curricula to enhance the students’ word knowledge.
Olamaei,M S and Haghghi Irani,F . (2026). The Impact of Uni-Thematic and Multi-Thematic Discussions on Developing L2 Vocabulary. (e736400). Applications of Language Studies, (), e736400 doi: 10.22034/jals.2026.2077953.1114
MLA
Olamaei,M S , and Haghghi Irani,F . "The Impact of Uni-Thematic and Multi-Thematic Discussions on Developing L2 Vocabulary" .e736400 , Applications of Language Studies, , , 2026, e736400. doi: 10.22034/jals.2026.2077953.1114
HARVARD
Olamaei M S, Haghghi Irani F. (2026). 'The Impact of Uni-Thematic and Multi-Thematic Discussions on Developing L2 Vocabulary', Applications of Language Studies, (), e736400. doi: 10.22034/jals.2026.2077953.1114
CHICAGO
M S Olamaei and F Haghghi Irani, "The Impact of Uni-Thematic and Multi-Thematic Discussions on Developing L2 Vocabulary," Applications of Language Studies, (2026): e736400, doi: 10.22034/jals.2026.2077953.1114
VANCOUVER
Olamaei M S, Haghghi Irani F. The Impact of Uni-Thematic and Multi-Thematic Discussions on Developing L2 Vocabulary. ALS. 2026;():e736400. doi: 10.22034/jals.2026.2077953.1114
