Three thoughts to add into the mix, re teacher leadership. We do mathematics and assessment work, but also capacity building in things like communication skills, understanding and managing mindsets, building support, planning.
Collective leadership is worth attending to.
I'd be interested in thoughts and experiences around this notion of leadership as a collective enterprise. Another, essential leadership role, of course, is innovation in one's own classroom. Not all teacher leaders are comfortable with pushing themselves into all roles, nor should they be expected to. We think leadership training efforts should account for this diversity in need and interest.