Marques, Susana C.Ribeiro, José Luís PaisLopez, Shane J.2013-11-092013-11-092011Journal of Happiness Studies, 12, 1049-10621389-4978http://hdl.handle.net/10400.12/2473This longitudinal study presents the first examination of the relation between positive psychology constructs, mental health and academic achievement of students in Portugal. Using a sample of 367 middle-school students, the study revealed that crosssectional and longitudinal patterns of correlations between positive variables were consistent with expectations for the most part and suggested that hope, life satisfaction and self-worth have meaningful relations with mental health and academic achievement. In addition, no significant changes were found between the variables in study across the administrations and throughout the two cohorts, and all the variables in study demonstrate moderate to high stability across a 1- and 2-year time frame. Hope predicts students’ academic achievement, and life satisfaction was the strongest predictor of mental health, over 2-years. The implications of the findings are discussed with reference to prior studies and for future research.engAcademic achievementChildren and adolescentsMental healthPositive psychology variablesjournal article