Communicating disciplinary knowledge to a wide audience in 3MT presentations: How students engage with popularization of science

3MT (Three-minute thesis) presentations, in which students communicate their theses to non-specialist audiences within three minutes, have emerged as an important academic genre, echoing current practices in scientific communication where researchers report their research work to a heterogeneous audience. Although increasing attention has been paid to 3MT presentations, we still lack sufficient knowledge of how presenters should communicate disciplinary knowledge to a wide audience. To address this gap, this corpus-based study investigates the rhetorical organization of moves (i.e. discoursal units serving various coherent communicative functions in text) in 80 3MT presentations from six disciplines. It is found that orientation, rationale, purpose, methods and results are five obligatory moves, among which the results move comprises more than one-fifth of the total length. The rationale and results moves are more often applied in hard sciences than in soft knowledge fields. The findings shed light on advanced academic literacy and how students communicate disciplinary knowledge to a wide audience.