One approach to designing, researching or evaluating professional learning experiences is to use models of learning processes. Here we analyse and critique five significant contemporary analytical models: three variations on path models, proposed by Guskey, by Desimone and by Clarke and Hollingsworth; a model using a systemic conceptualisation of learning by Opfer and Pedder; and a cognitive learning model by Evans. To do this, we develop and illustrate an analytical framework focused on model components, purposes, scope, explicit and implicit theories of learning and change processes, agency and philosophical underpinnings. We identify similarities, differences, inconsistencies and limitations in the models. This provides the basis for reconceptualising models as tools to be deployed alongside other relevant constructs and thus the analytical framework can support a more informed selection of theoretical models by researchers and practitioners.

Internationally, there is increasing emphasis on teacher leadership of professional development. This provides opportunities for teachers to initiate and facilitate professional learning activities beyond their own schools. There is a need for theoretical tools to analyse their leadership activity and how to support it. Constructs from complexity leadership theory and the concept of teacher system leadership are used to develop a framework to analyse the purposes and practices of teacher professional development leaders supported by a national programme for mathematics teacher professional development in England. I argue that the teachers’ activities constitute a form of adaptive leadership involving innovating and organising professional development within arenas of leadership, through the processes of mobilising, brokering and the creation of networks. This required engaging in ‘system work’ to fulfil purposes connected to both local and system-wide concerns. The teachers were supported by the enabling leadership of headteachers and by national warrants for exercising leadership. The study demonstrates the value of the analytical framework and indicates that a cadre of teacher system leaders can be developed by attending to the interplay of professional development leadership and a wider system-orientated professional identity and by specific support to develop adaptive leadership capacities and skills.

The increasing importance of educational collaborations and networks that blur organizational boundaries requires conceptual developments in leadership theory. One approach to both theorizing and promoting such phenomena is through the idea of system leadership. Three different meanings of the term are identified: interschool leadership; a systemic leadership orientation and identity; and leadership of the school system as a whole. Previous descriptions of system leadership, and policy initiatives related to it, have focused on headteachers and senior leaders. However, teacher leaders may also exercise system leadership in relation to all three meanings. Professional development networks and school collaborations provide a range of distinct contexts for interschool leadership by teacher leaders and these are identified. This extends existing theories of teacher and distributed leadership. Further, it is proposed that teacher leaders can, like headteachers, have a systemic leadership practice orientation that is informed by moral purposes. The model of teacher activist professional identity provides a starting point for analysing teacher system leadership identity. Teacher leaders can and do influence system-wide change and, to conceptualize this, the concept of system leadership from below is introduced. In making this argument a number of issues and methodological tools are identified that are important in researching both headteacher and teacher system leadership in relation to the three meanings of system leadership.

Transformative professional learning is connected to educational and social transformation and possibilities for critical forms of teacher professionalism. Examining and fostering this connection requires greater conceptual clarity about these constructs and how they are enacted. A conceptual review, combining narrative and systematic methods, was undertaken of research on transformative professional learning that embraced educational and social change, and of accounts of professional learning associated with critical forms of professionalism: activist, transformative, and democratic. A common analytical framework was used consisting of modes of professional learning, educational purpose, knowledge, sociality, agency, and material and systemic arrangements. The conceptual framework used in this review has wider potential for analysing professional learning and its outcomes. The review indicates that transformative professional learning is under-theorised with accounts emphasising only one or two features, usually agency, collaboration, or educational purpose. We argue that transformative professional learning should be grounded, additionally, in clarity about purpose, knowledge, and the relationship to knowledge that is developed. Different possibilities for enacting professional learning are identified that can foster critical teacher professionalism, including those rooted in teacher activism connected to wider social movements.