How much of a teacher’s professional life should be spent in professional development? How about a coordinator? An administrator? What constitutes professional development? Taking a class, going to a conference, watching a webinar or attending a committee are certainly all activities that everyone in the education field will agree are professional development related, so long as the class, conference, webinar and/or committee are education related.
What about less organized activities? Collaborative planning, data analysis of student work, book groups about education-related material and peer observations have all come to be recognized as professional development too. Over many decades, the nature of professional development has evolved to include much more than organized conferences and seminars, and rightly so.