“…The software, task, and knowledge engineering aspects of the task model are described in (Sharples, du Boulay, Jeffery, Teather, & Teather, 1996;Sharples et al, 1995;Sharples et al, 1997;Teather, Sharples, Jeffery, Teather, & du Boulay, 1994). In summary, the task model provides an analytic account of:…”