Antonia Bertolino Guglielmo De Angelis Alessio Di Sandro Antonino Sabetta Is my model right? Let me ask the expert. 1089-1099 2011 84 Journal of Systems and Software 7 http://dx.doi.org/10.1016/j.jss.2011.01.054 db/journals/jss/jss84.html#BertolinoASS11