▁time . ▁When ▁product ▁pre - re quis ites ▁and ▁parameters ▁have ▁been ▁more ▁completely ▁defined , ▁output ▁from ▁the ▁CA ID ▁software ▁can ▁be ▁imported ▁into ▁a ▁C AD ▁program ▁for ▁pre - production ▁testing , ▁adjust ment , ▁and ▁generation ▁of ▁technical ▁draw ings ▁and ▁manufact uring ▁data ▁such ▁as ▁C NC ▁tool - paths . ▁ ▁CA ID ▁is ▁far ▁more ▁concept ual ▁and ▁less ▁techn ically ▁focused ▁than ▁C AD . ▁CA ID ▁programs ▁tend ▁to ▁offer ▁more ▁tools ▁that ▁allow ▁a ▁designer ▁to ▁freely ▁express ▁themselves ▁with ▁more ▁organ ic ▁shapes ▁and ▁complex ▁curves , ▁whilst ▁C AD ▁software ▁tends ▁to ▁be ▁more ▁focused ▁on ▁tools ▁for ▁the ▁simple ▁curves ▁and ▁straight ▁lines ▁more ▁suitable ▁for ▁easy ▁manufact uring . ▁ ▁C AD ▁implementations ▁have ▁evol ved ▁dram atically ▁since ▁initial ▁ 3 D ▁offer ings ▁in ▁the ▁ 1 9 7 0 s , ▁which ▁were ▁typically ▁limited ▁to ▁producing ▁draw ings ▁similar ▁to ▁hand - d raft ed ▁output . ▁Adv ances ▁in ▁programming ▁and ▁computer ▁hardware ,[ 2 1 ][ 2 2 ] ▁not ably ▁solid ▁mod elling ▁in ▁the ▁ 1 9 8 0 s , ▁have ▁allowed ▁more ▁vers atile ▁applications ▁of ▁computers ▁in ▁design ▁activities . ▁ ▁See ▁also ▁ ▁Indust rial ▁Design ▁ ▁Free form ▁surface ▁mod elling ▁ ▁Class ▁A ▁Sur faces ▁ ▁Production ▁ ▁In jection ▁m old ing ▁ ▁Autom obile ▁design ( Y ) ▁ ▁Ali as Studio , ▁I CE M ▁Sur f , ▁N X