The more I see systematic literature reviews, the less reliable I think they are. In the current case (26 page PDF), the author surveys the literature between the years 2004-2018 to find articles investigating the use of web 2.0 technology in problem-based learning (PBL) and finds only 18 articles to include in the review, the vast majority of which use the wiki in PBL. It's hard to believe that the academic record on this topic is so sparse, even if the selection is limited to "only high quality peer-reviewed published articles". The author found "the most frequent finding was the effectiveness of Web 2.0 technologies supporting PBL." Given the paper selection process, I would have been shocked had there been any other result.
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