“…In contrast, professional development can also be completely expert driven. In between these extremes, there are various forms of collaboration between researchers and teachers that lead to enhanced expertise, such as co-teaching (Roth, Tobin and Zimmermann, 2002), action research (Jaworski, 1998), learning studies (Ling Lo, Marton, Fai Pang and Yan Pong, 2004), teacher development experiments (Simon, 2000), teaching experiments (Norton and McCloskey, 2008) and design research (Brown, 1992;Collins, 1992;Gravemeijer and Cobb, 2006).…”