“…On the other hand, some of the early issues raised by Reisner (1981Reisner ( , 1982 still remain with respect to hybrid systems, psychological factors, user expectation and population stereotypes, scaling up to realistic systems (Berstel, Reghizzi, Roussel & San Pietro, 2005), and making formal methods accessible to and usable by non-specialists (Chakrabarti & Sukumaran, 2009;Gow, Thimbleby, & Cairns, 2006).…”