Certain social groups are over-represented in the criminal justice system. This includes minority ethnic groups, younger people and men. This over-representation is partly a result of differences in offending behaviour and partly a result of systemic effects which act to select some people into the justice system more than others. Our research will examine the extent to which there are inequalities in justice system contact as a result of age, sex and socio-economic status, as well as other factors. We will also examine the extent to which social change has impacted on the relationship between justice inequalities and individual outcomes.