“…In other words, high school EFL teachers are generally encouraged to utilize group work as much as possible, especially in speaking classes, but whether or not they are fully aware of its benefits and possible problems/drawbacks as well as how to conduct it in an effective way is still open to questions because little has been known about such questions based on empirical research. Moreover, previous studies on group work such as Ababneh (2017), Ibnian (2012), John (2017), Othman and Murad (2015), Taqi and Al-Nouh (2014), and so on have largely focussed on learners' attitudes and gained inconclusive results across the board. Within Vietnam's setting, quite a number of studies have been reported concerning group work or cooperative learning and almost all of them, such as Duyen and Huan (2017), Le (2006), Luu (2010), Pham (2019), Thanh-Pham (2011), Tran and Lewis (2012), were conducted at college level only.…”