“…Firstly, building on the isolated elements effect which posits that for novices very complex information is at times better separated in individual elements first (Pollock, Chandler, & Sweller, 2002), authors hypothesized that learning would improve if novices are presented with isolated parts of a complex character before being presented with the whole character (i.e., isolated-integrated vs. integrated only). Secondly, drawing on the finding that adding variability across learning tasks helps learners construct more general knowledge and thereby boost test performance (i.e., the variability effect, see: Likourezos, Kalyuga, & Sweller, 2019;Paas & Van Merriënboer, 1994) Richey et al, 2019;Schmitz, Schnabel, Stricker, Fischer, & Guttenstormsen, 2017). The focus on including errors in examples started early in social-cognitive research, where many studies compared the effects of mastery models showing an ideal performance to coping models showing and later on correcting performance errors (e.g., Schunk & Hanson, 1985).…”