“…Context comparison occurred in 10 studies (13.2%) in the form of comparison between virtual and face-to-face mentoring [63], emotions towards online learning [101], 3D animation vs. video only teaching [72], self-performance and puppetry discourse [103], cognition in different multimedia materials [18], learning strategy models [24], [88], dimensions for learning progress diagnosis [97], scaffolding methods [51] and discourse segmentation methods [47]. Comparisons between different participant categories were reported in 10 studies (13.2%), for example, mentor vs. student epistemic frames [12], [60], [70], dyads vs. individuals' networks [16], [17], short readers vs. long readers [49], and medical vs. teacher students [98].…”