Many organisations hire students from cooperative education (co-op) programmes. These organisations are interested in students' performance, particularly in their "extra-role" performance. Previous studies show that socialisation processes play an important part in establishing adjustment and performance. It may also be the case that students' approach to learning (their motivations, attitudes and strategies) influences the socialisation process, and consequently adjustment and performance. The purpose of this study was to examine the influence of co-op students' "lifelong learning characteristics" on two organisational socialisation outcomes (role understanding and social acceptance) and three types of extra-role performance (proactive, adaptive and prosocial). Data were collected from a cross-sectional survey of undergraduates (n = 1698) enrolled in co-op who had just completed a work term in a new role. Regression analyses showed that lifelong learning characteristics influenced both forms of adjustment, and all three forms of performance. Further mediation analyses showed that both forms of adjustment partially mediated the relationships between lifelong learning and all three forms of performance. These results suggest that co-op students' lifelong learning characteristics play an important role during organisational socialisation and subsequent extra-role performance. Implications for future research and for practice are discussed.