Educational data mining for understanding students' behavior in a virtual learning environments: a case study - Paiva, Paula Maria Pereira; Penteado, Bruno; Zupelari, Marina Morettin; Lopes, Natália Barreto Frederigue; Costa Filho, Orozimbo Alves; Isotani, Seiji; Ferrari, Deborah Viviane (International Meeting on Internet & Audiology, 2017)