“…To achieve this aim and overcome the limits of knowledge transmission, we designed a method that combines : (1) tools of visual ethnography, particularly the first-person perspective digital ethnography (Goldman & al., 2007 ;Knoblauch & al., 2006 ;S. Lahlou, 2011 ;Omodei & al., 2005 ;Pea, 1994 ;Rix-Lièvre & Lièvre, 2010) provided by a subcam (subjective camera) (Lahlou, 1998) which is a small digital camera worn at eye-level by the expert himself ; (2) theoretical and methodological frameworks drawn from ergonomics and work psychology, especially Activity Theory (Daniellou & Rabardel, 2005 ;Leontiev, 1978 ;Nosulenko & Rabardel, 2007 ;Nosulenko & Samoylenko, 1997) and Perceived Quality Approach (Nosulenko & Samoylenko, 2009) ; and (3) verbalisation methods (Bisseret, 1981 ;Brommel, 1983 ;Clot & al., 2001 ;Clot & Kostulski, 2011 ;Ericsson & Simon, 1980 ;Falzon, 1991 ;Flaherty, 1974 ;Leplat & Hoc, 1981 ;Mollo & Falzon, 2004 ;Theureau, 2003 ;Titchener, 1912) in order to analyse occupational expertise embodied in human activity.…”