". ▁He ▁had ▁also ▁extensive ▁discuss ions ▁with ▁Larry ▁Brown stein ▁and ▁Ad rian ▁Hay es ▁on ▁the ▁possibility ▁of ▁a ▁mathematical ▁formal ization ▁of ▁Par s ons ' ▁theory . ▁ ▁S ick ▁role ▁theory ▁Par s ons ▁had ▁worked ▁intens ively ▁with ▁questions ▁of ▁medical ▁soci ology , ▁the ▁medical ▁profession , ▁psych iat ry , ▁psych os om atic ▁problems , ▁and ▁the ▁questions ▁of ▁health ▁and ▁ill ness . ▁Most ▁of ▁all ▁Par s ons ▁had ▁become ▁known ▁for ▁his ▁concept ▁of ▁" the ▁S ick ▁role ". ▁The ▁last ▁field ▁of ▁social ▁research ▁was ▁an ▁issue ▁that ▁Par s ons ▁constantly ▁developed ▁through ▁elabor ation ▁and ▁self - crit ic ism . ▁Par s ons ▁participated ▁at ▁the ▁World ▁Congress ▁of ▁Soci ology ▁in ▁Toronto ▁in ▁August ▁ 1 9 7 4 ▁at ▁which ▁he ▁presented ▁a ▁paper , ▁" The ▁S ick ▁Ro le ▁Re vis ited : ▁A ▁Response ▁to ▁Crit ics ▁and ▁an ▁Up dating ▁in ▁Term s ▁of ▁the ▁Theory ▁of ▁Action ", ▁which ▁was ▁published ▁under ▁a ▁slightly ▁different ▁title , ▁" The ▁S ick ▁Ro le ▁and ▁the ▁Ro le ▁of ▁the ▁Phys ician ▁Re cons ider ed ", ▁in ▁ 1 9 7 5 . ▁In ▁his ▁ess ay , ▁Par s ons ▁highlight ed ▁that ▁his ▁concept ▁of ▁" s ick ▁role " ▁never ▁was ▁meant ▁to ▁be ▁conf ined ▁to ▁" de vi ant ▁behavior ", ▁but ▁" its ▁negative ▁valu ation ▁should ▁not ▁be ▁forgotten ." ▁It ▁was