A Recommender System Based on Effort: Towards Minimising Negative Affects and Maximising Achievement in CS1 Learning. - Filipe D. Pereira; Hermino B. F. Junior; Luiz Rodriguez; Armando M. Toda; Elaine H. T. Oliveira; Alexandra I. Cristea; David B. F. Oliveira; Leandro S. G. Carvalho; Samuel C. Fonseca; Ahmed Alamri; Seiji Isotani (ITS, 2021)