The context of the research was senior leadership teams in schools in Australia. The study investigated relationships between task interdependence, psychological collectivism, self-efficacy for teamwork, and team member perceptions of leadership functions. A cross-sectional and correlational research design was employed. Fifty-seven senior leadership teams composed of principals and senior teachers within two Catholic education systems in New South Wales, Australia, participated in the study. Data were collected from an online survey completed by senior leadership team members and analyzed using multilevel data analysis strategies. The findings suggest the extent of functional leadership was positively related to perceived task interdependence.