Dear Professor Cottrell, I have a suggestion regarding the model window menu layout. I think you would agree that, currently, the "Tests" menu is a bit overloaded while the "Edit" menu has just 2 items. Consequently, I think it would be much better if these 2 menus are reorganized so that the former has actions and tests regarding "Specification" while the latter has those regarding "Diagnostics". Sincerely Talha -- “An expert is a person who has made all the mistakes that can be made in a very narrow field.” - Niels Bohr (1885-1962) --