▁scientific ▁domains ▁like ▁intelligence , ▁there ▁might ▁be ▁an ▁additional , ▁higher ▁level ▁of ▁organization ▁within ▁person ality ▁which ▁would ▁provide ▁a ▁structure ▁for ▁the ▁many ▁primary ▁tra its . ▁ ▁When ▁he ▁factor ▁analyz ed ▁the ▁inter cor rel ations ▁of ▁the ▁ 1 6 ▁primary ▁trait ▁measures ▁themselves , ▁he ▁found ▁no ▁fewer ▁than ▁five ▁" second - order " ▁or ▁" global ▁factors ", ▁now ▁commonly ▁known ▁as ▁the ▁Big ▁Five . ▁These ▁second - str atum ▁or ▁" global ▁tra its " ▁are ▁concept ual ized ▁as ▁broad , ▁over arch ing ▁domains ▁of ▁behavior , ▁which ▁provide ▁meaning ▁and ▁structure ▁for ▁the ▁primary ▁tra its . ▁ ▁For ▁example , ▁the ▁" global ▁trait " ▁Ext ra version ▁has ▁emer ged ▁from ▁factor - anal yt ic ▁results ▁compr ising ▁the ▁five ▁primary ▁trait ▁factors ▁that ▁are ▁inter person al ▁in ▁focus . ▁ ▁Thus , ▁" global " ▁Ext ra version ▁is ▁fund ament ally ▁defined ▁by ▁the ▁primary ▁tra its ▁that ▁are ▁grouped ▁together ▁factor ▁analyt ically , ▁and , ▁moving ▁in ▁the ▁opposite ▁direction , ▁the ▁second - order ▁Ext ra version ▁factor ▁gives ▁concept ual ▁meaning ▁and ▁structure ▁to ▁these ▁primary ▁tra its , ▁ident ifying ▁their ▁focus ▁and ▁function ▁in ▁human ▁person ality . ▁ ▁These ▁two ▁levels ▁of ▁person ality ▁structure ▁can ▁provide ▁an ▁integrated ▁understanding ▁of ▁the ▁whole ▁person , ▁with ▁the ▁" global ▁tra its " ▁giving ▁an ▁over view ▁of ▁the ▁individual ' s ▁function ing ▁in ▁a ▁broad