ical , ▁rep lic able ▁and ▁universal ▁principles . ▁S eld om ▁has ▁psych ology ▁had ▁such ▁a ▁determined , ▁system atic ▁expl orer ▁dedicated ▁not ▁only ▁to ▁the ▁basic ▁search ▁for ▁scientific ▁knowledge ▁but ▁also ▁to ▁the ▁need ▁to ▁apply ▁science ▁for ▁the ▁benefit ▁of ▁all ." ▁▁ ▁Also , ▁according ▁to ▁She e hy ▁( 2 0 0 4 , ▁p .   6 2 ), ▁ ▁" C att ell ▁made ▁fundamental ▁contributions ▁to ▁our ▁understanding ▁of ▁ability ▁and ▁the ▁structure ▁of ▁person ality ." ▁ ▁In ▁ 1 9 9 4 , ▁C att ell ▁was ▁one ▁of ▁ 5 2 ▁sign ator ies ▁on ▁" Main stream ▁Science ▁on ▁Int elligence ," ▁an ▁editor ial ▁written ▁by ▁L inda ▁Gott fred son ▁and ▁published ▁in ▁the ▁Wall ▁Street ▁Journal ▁which ▁declared ▁the ▁cons ensus ▁of ▁the ▁signing ▁sch ol ars ▁on ▁I Q ▁research ▁following ▁the ▁publication ▁of ▁the ▁book ▁The ▁Bell ▁Cur ve . ▁▁ ▁His ▁works ▁can ▁be ▁categor ized ▁or ▁defined ▁as ▁part ▁of ▁cogn itive ▁psych ology , ▁due ▁to ▁his ▁nature ▁to ▁measure ▁every ▁psych ological ▁aspect ▁especially ▁person ality ▁aspect . ▁ ▁Mult ivari ate ▁research ▁R ather ▁than ▁purs ue ▁a ▁" un ivari ate " ▁research ▁approach ▁to ▁psych ology , ▁studying ▁the ▁effect ▁that ▁a ▁single ▁variable ▁( such ▁as ▁" domin ance ") ▁might ▁have ▁on ▁another ▁variable ▁( such ▁as ▁" dec ision - making "), ▁C att ell ▁pione ered ▁the ▁use ▁of ▁mult ivari ate