“…Unveiling professional development 6 The notion that skill development can be conceptualised as an accumulation of a defined body of knowledge and skills has been questioned extensively from within a range of research approaches (e.g., Ball & Cohen, 1999;Benner, 1984;Billett, 2001;Borko & Putnam, 1996;Dall'Alba, 2002Dreyfus & Dreyfus, 1986;Dreyfus, 2002;Dall'Alba & Barnacle, 2005;Dall'Alba & Sandberg, 1996;Fielding, 1988a;Hargreaves & Fullan, 1992;Hunt, 1987;Lave, 1993;Little, 1993;McDermott, 1993;Robertson, 1992;Sandberg, 1994Sandberg, , 2000Sandberg, , 2001Sandberg & Pinnington, in preparation;Schön, 1983Schön, , 1987Tsoukas, 1996;Tsoukas & Vladimirou, 2001;Winograd & Flores, 1986). Models based upon such a conceptualisation have been challenged and extended in one of the most advanced and influential models of skill acquisition proposed by Hubert and Stuart Dreyfus (1986;Dreyfus, 2002).…”