“…Although group discussion is one of the techniques that can boost learners' critical thinking skills (Hasanah & Malik, 2020;Sriarunrasmee et al, 2015), students in Vietnam are familiar with passive learning which is mostly teacher-oriented (Le, 2011). Passive learning is not suitable for critical thinking (Snider & Schnurer, 2002) and can prevent learners from developing their ability to compare, contrast, and evaluate different ideas, which are necessary for critical thinking skills (Altakhaineh et al, 2019;Seedhouse & Egbert, 2006). Also, classes with low learning outcomes often witness students' lack of confidence and information for discussions (Purvis et al, 2014, as cited in Oktavia & Ridlo, 2020.…”