ality ▁the or ists ▁t ended ▁to ▁provide ▁little ▁objective ▁evidence ▁or ▁research ▁bases ▁for ▁their ▁theories . ▁ ▁C att ell ▁wanted ▁psych ology ▁to ▁become ▁more ▁like ▁other ▁sciences , ▁where by ▁a ▁theory ▁could ▁be ▁tested ▁in ▁an ▁objective ▁way ▁that ▁could ▁be ▁understood ▁and ▁rep licated ▁by ▁others . ▁In ▁C att ell ' s ▁words : ▁ ▁" P s ych ology ▁appeared ▁to ▁be ▁a ▁j ung le ▁of ▁confusing , ▁conflic ting , ▁and ▁arbitrary ▁concepts . ▁ ▁These ▁pre - s cient ific ▁theories ▁doubt less ▁contained ▁ins ights ▁which ▁still ▁sur pass ▁in ▁ref in ement ▁those ▁dep ended ▁upon ▁by ▁psych iat rist s ▁or ▁psych olog ists ▁today . ▁ ▁But ▁who ▁knows , ▁among ▁the ▁many ▁brilliant ▁ideas ▁offered , ▁which ▁are ▁the ▁true ▁ones ? ▁ ▁Some ▁will ▁claim ▁that ▁the ▁statements ▁of ▁one ▁the or ist ▁are ▁correct , ▁but ▁others ▁will ▁favour ▁the ▁views ▁of ▁another . ▁ ▁Then ▁there ▁is ▁no ▁objective ▁way ▁of ▁sorting ▁out ▁the ▁truth ▁except ▁through ▁scientific ▁research ." ▁ ▁Emer it us ▁Professor ▁Arthur ▁B . ▁Sw en ey , ▁an ▁expert ▁in ▁psych ometric ▁test ▁construction , ▁sum med ▁up ▁C att ell ' s ▁method ology : ▁ ▁"[ C att ell ] ▁was ▁without ▁exception ▁the ▁one ▁man ▁who ▁made ▁the ▁most ▁major ▁str ides ▁in ▁system at izing ▁the ▁field ▁of ▁behavior al ▁science ▁from ▁all ▁of ▁its ▁diverse ▁fac ets ▁into ▁a ▁real ▁science ▁based ▁on ▁empir