. ▁Given ▁that ▁many ▁consum ers ▁become ▁aware ▁of ▁br ands ▁via ▁advert ising ▁or ▁market ing ▁communic ations , ▁the ▁A ID A ▁model ▁helps ▁to ▁explain ▁how ▁an ▁advert is ement ▁or ▁market ing ▁communic ations ▁message ▁eng ages ▁and ▁involves ▁consum ers ▁in ▁brand ▁choice . ▁In ▁ess ence , ▁the ▁A ID A ▁model ▁propos es ▁that ▁advert ising ▁messages ▁need ▁to ▁accomplish ▁a ▁number ▁of ▁tasks ▁in ▁order ▁to ▁move ▁the ▁consumer ▁through ▁a ▁series ▁of ▁sequ ential ▁steps ▁from ▁brand ▁aw aren ess ▁through ▁to ▁action ▁( p urchase ▁and ▁consumption ). ▁ ▁The ▁A ID A ▁model ▁is ▁one ▁of ▁the ▁longest ▁serving ▁models ▁used ▁in ▁advert ising , ▁having ▁been ▁developed ▁in ▁the ▁late ▁nin ete enth ▁century . ▁Since ▁its ▁first ▁appearance ▁in ▁the ▁market ing ▁and ▁advert ising ▁literature , ▁the ▁model ▁has ▁been ▁modified ▁and ▁expanded ▁to ▁account ▁for ▁the ▁advent ▁of ▁new ▁advert ising ▁media ▁and ▁communic ations ▁platforms . ▁A ▁number ▁of ▁modified ▁alternative ▁models ▁are ▁in ▁current ▁use . ▁During ▁the ▁past ▁ 1 0 0 ▁years , ▁the ▁model ▁has ▁under g one ▁many ▁ref in ements ▁and ▁extensions , ▁such ▁that ▁today ▁there ▁are ▁many ▁variants ▁in ▁circul ation . ▁ ▁Thus , ▁the ▁simple ▁A ID A ▁model ▁is ▁now ▁one ▁of ▁a ▁class ▁of ▁models , ▁collect ively ▁known ▁as ▁hier arch ical ▁models ▁or ▁hierarchy ▁of ▁effects ▁models . ▁ ▁The ▁A ID A ▁model ▁ ▁The ▁A ID A ▁model ▁is ▁just ▁one