" ▁emer ges , ▁it ▁is ▁related ▁to ▁specific ▁historical ▁circumstances ▁but ▁is ▁not ▁a ▁general ▁law ▁of ▁the ▁social ▁systems . ▁ ▁AG IL ▁parad ig m ▁The ▁he ur istic ▁scheme ▁that ▁Par s ons ▁used ▁to ▁analyze ▁systems ▁and ▁sub system s ▁is ▁called ▁the ▁AG IL ▁parad ig m ▁or ▁the ▁AG IL ▁scheme . ▁To ▁surv ive ▁or ▁maintain ▁equilibrium ▁with ▁respect ▁to ▁its ▁environment , ▁any ▁system ▁must ▁to ▁some ▁degree ▁adapt ▁to ▁that ▁environment ▁( ada pt ation ), ▁att ain ▁its ▁goals ▁( goal ▁att ain ment ), ▁integrate ▁its ▁components ▁( integration ), ▁and ▁maintain ▁its ▁lat ent ▁pattern ▁( l aten cy ▁pattern ▁Main ten ance ), ▁a ▁sort ▁of ▁cultural ▁template . ▁The ▁concepts ▁can ▁be ▁abbre vi ated ▁as ▁AG IL ▁and ▁are ▁called ▁the ▁system ' s ▁functional ▁imper atives . ▁It ▁is ▁important ▁to ▁understand ▁that ▁Par s ons ▁AG IL ▁model ▁is ▁an ▁analyt ical ▁scheme ▁for ▁the ▁sake ▁of ▁theoretical ▁" production ", ▁but ▁it ▁is ▁not ▁any ▁simple ▁" copy " ▁or ▁any ▁direct ▁historical ▁" summary " ▁of ▁empir ical ▁reality . ▁Also , ▁the ▁scheme ▁itself ▁does ▁not ▁explain ▁" any thing ", ▁just ▁as ▁the ▁period ical ▁table ▁nothing ▁by ▁itself ▁in ▁the ▁natural ▁sciences . ▁The ▁AG IL ▁scheme ▁is ▁a ▁tool ▁for ▁explan ations ▁and ▁is ▁no ▁better ▁than ▁the ▁quality ▁of ▁the ▁theories ▁and ▁explanation ▁by ▁which ▁it ▁is ▁processed . ▁ ▁In ▁the ▁case ▁of ▁the ▁analysis ▁of ▁a