“…Some studies have also combined two or more interventions simultaneously to measure their joint influence (e.g., Griffin, Wiley, et al, 2019;Martin, Nguyen, & McDaniel, 2016). In these studies, participants in the experimental condition received more than one kind of intervention, such as rereading plus selfexplaining (S. Chen, 2010), delayed-keyword-generation plus collaborative learning (Pao, 2014), test expectancy manipulation plus self-explaining (Griffin, Wiley, et al, 2019), and so on (Martin et al, 2016). These effects were classified into a single categoryintervention combinationsas each of these combinations has been exposed to few investigations.…”