“…However, intention has been shown to be an essential aspect of various health behaviours (Asare, 2015;McDermott et al, 2015), and also RTW after sick leave for musculoskeletal injuries (Dunstan et al, 2013). The roots of studying intention can be | 603 HEDLUND found in the 1970s (Rossetti et al, 2014), when psychologists were trying to evaluate the constituent parts of human behaviour in an effort to make sense of it. There is, however, no clear definition of the concept (Rossetti et al, 2014).…”