Early school-leaving exerts substantial costs on the individual and society. The literature indicates that quitting school early is predicted by an enmeshed group of indicators including academic and behavioural difficulties in school, deprived economic background and disengagement with the educational process. The beliefs and background of a main sample of 1,311 Junior Certificate students and a sub-sample of 188 fifth year students were assessed. Data were gathered on Intention to leave school early, constructs of the Theory of Planned Behaviour around Leaving Certificate completion, students’ academic attainment, cognitive ability, willingness to defer gratification, along with socio-demographic data. Modelling indicated that positive attitudes about the potential of the Leaving Certificate, and parents, and teachers perceived to be strongly pro-school completion are key to the intention to stay on. Performing well intellectually is a contributing factor. Economic deprivation does not exert a direct influence on intention, but it strongly shapes intellectual performance.Other funderCombat Poverty AgencyUCD seed funding schemeti,ke,sp.kpw29/9/1