Engaging in learning with colleagues is paramount for teachers to enhance students' learning. To be effective and sustainable, it requires engagement both by individual teachers as well as whole teams. Surprisingly however, research examining learning activity as a characteristic of individuals "in" teams and a property "of" teams, as well as their antecedents on both levels, is still scarce. This study examined how perceptions of transformational leadership, as mediated by goal interdependence and collective-efficacy, facilitate teachers' engagement in information sharing, and whether effects are similar for individuals and teams. Questionnaire data were analyzed using multilevel structural equation modelling. Results showed that individual engagement in information sharing and individuals' perceptions of goal interdependence were directly impacted by transformational leadership practices. Information sharing of teams, and collective efficacy, were impacted by consistent perceptions of goal interdependence. Teachers shape their learning amongst themselves in teams, with individual support from their leader.