“…), so it is difficult to compare them, and furthermore, they reach contradictory conclusions. Thus, while Moreno and Mayer (2002) and Blokzijl and Andeweg (2005) point to the effectiveness of PowerPoint in the recall of the material presented in class, other studies have shown how students achieve better results in a teacher-centred class without a PowerPoint presentation (Amare, 2006;Erwin & Rieppi, 1999), or simply no significant differences are observed between the two groups studied (Apperson et al, 2006;Barlett & Strough, 2003;Susskind, 2008). Other studies (Savoy et al, 2009) have focused on the effectiveness of the recall of material depending on the kind of information presented (graphic or verbal), stressing that students recalled around 15% less verbal information when it was presented with PowerPoint.…”