
I understand that this change, specifically within teaching, is part of the change in reclaiming (or claiming) of teaching as a profession. The push in the context of a move from a percieved technocratic view of teaching, where teachers are 'trained' in the 'art and craft' of teaching, towards a learned and research based profession. The term 'professional development', in this context perhaps reflects the model where outside influences will 'develop' the teacher's skills, through delivering short courses. This compares to a 'professional learning' model where the teacher is at the core of the learning, learning may not be based on preset outcomes, but it is ongoing, involve collaboration and be long term.
Although governing bodies in New Zealand and England are moving towards using the term 'professional learning', there appears to be a flip flopping between the two terms.