Heavy usage of online games may negatively affect the gamer's health and take a toll on school performance. However, to date, no study has utilized a longitudinal design to identify predictors of heavy usage of online games after a year of play. This study thus refers to relevant theories (e.g.,...

The paper has as goal to revisit the general concept of causality, with some specifications to the social (especially economic) field. The logical conditions of causality (individual causes as well multiple causes) are proposed and evaluated. Based on causality concept, the correlation notion is...