Through discursive analysis of narratives of practice, this study examines the tensions and opportunities that arise for teacher educators as a result of implementing a teaching performance assessment into an existing program of study. The introduction of the Graduate Teacher Performance Assessment (GTPA®) 1 , and the requirements to ensure assessment fidelity, disrupted our thinking, programmatic curricular and organisational structures. Drawing on the notion of collaborative professionalism, we analyse our implementation experiences and reflect on our professional learning in relation to the sites of practice (the university and partner schools) for our work, and the risks of implementation. Moreover, we draw on nuanced notions of accountability to illuminate how we have reconceptualised and reimagined our work as teacher educators. Simultaneously, we assert our capacity as teacher educators to shape and steer decision-making in initial teacher education (ITE) in ways that respond to the needs of the communities our graduate teachers serve.