The starting point for this article is the lack of a robust research base regarding details of what works and why for school leaders' professional development. The article extends work undertaken for a recent commissioned literature review of selected international reports on supporting school leaders' development strategies. The authors reveal that the leadership learning landscape seems to be one where system provision over-shadows individuals taking personal responsibility for their leadership learning. In an endeavour to create a balance between system and individual agendas, the authors have created an augmented version of a leadership learning heuristic tool originally developed by Clarke and Wildy. The tool is designed as a starting point only, intended to help leaders identify the state of their current knowledge about leadership as well as their future professional development needs using the tool's five focal points - pedagogy, people, place, system and self. An example of the tool completed by a practising principal is used to show his current leadership knowledge profile and the knowledge fields on which he will need to focus his learning in the future. The authors conclude with suggestions for further research on personal agency in school leadership learning.