▁some ▁of ▁which ▁have ▁been ▁reported ▁in ▁case ▁studies . ▁ ▁Us age - center ed ▁design ▁and ▁activity - center ed ▁design ▁approach ▁Us age - center ed ▁design ▁share ▁some ▁common ▁ideas ▁with ▁activity - center ed ▁design . ▁It ▁is ▁concerned ▁more ▁with ▁the ▁activities ▁of ▁users ▁but ▁not ▁the ▁users ▁per ▁se . ▁Const antine ▁( 2 0 0 6 ) ▁presents ▁an ▁integrated ▁framework ▁where ▁the ▁models ▁of ▁Us age - center ed ▁design ▁are ▁en rich ed ▁with ▁concepts ▁from ▁the ▁Activity ▁theory . ▁ ▁References ▁ ▁Cit ations ▁ ▁Bibli ography ▁ ▁Const antine ▁L . ▁Activity ▁Model ing : ▁Tow ard ▁a ▁Prag m atic ▁Integr ation ▁of ▁Activity ▁Theory ▁with ▁Us age - Center ed ▁Design , ▁ 2 0 0 6 ▁Const antine ▁L ., ▁and ▁Lock wood , ▁L . ▁" Str ucture ▁and ▁Style ▁in ▁Use ▁C ases ▁for ▁User ▁Inter faces ." ▁In ▁M . ▁van ▁Harm el an , ▁Ed ., ▁Object ▁Model ing ▁and ▁User ▁Interface ▁Design . ▁Boston : ▁Add ison - W es ley , ▁ 2 0 0 1 . ▁Const antine ▁L ., ▁and ▁Lock wood , ▁L . ▁Software ▁for ▁Use : ▁A ▁Pract ical ▁Guide ▁to ▁the ▁Ess ential ▁Mod els ▁and ▁Method s ▁of ▁Us age - Center ed ▁Design . ▁Reading , ▁MA : ▁Add ison - W es ley , ▁ 1 9 9 9 . ▁( Russ ian ▁translation ▁ 2 0 0 4 , ▁Chinese ▁translation ▁