▁dimensions ▁of ▁the ▁physical ▁world ▁that ▁were ▁discovered ▁and ▁presented , ▁for ▁example , ▁in ▁the ▁periodic ▁table ▁of ▁chemical ▁elements . ▁ ▁In ▁ 1 9 6 0 , ▁C att ell ▁organized ▁and ▁conven ed ▁an ▁international ▁sym pos ium ▁to ▁increase ▁communication ▁and ▁co operation ▁among ▁research ers ▁who ▁were ▁using ▁mult ivari ate ▁statistics ▁to ▁study ▁human ▁behavior . ▁ ▁This ▁resulted ▁in ▁the ▁foundation ▁of ▁the ▁Society ▁of ▁Mult ivari ate ▁Ex perimental ▁Psych ology ▁( S ME P ) ▁and ▁its ▁flags hip ▁journal , ▁Mult ivari ate ▁Be havior al ▁Research . ▁He ▁brought ▁many ▁research ers ▁from ▁Europe , ▁Asia , ▁Africa , ▁Australia , ▁and ▁South ▁America ▁to ▁work ▁in ▁his ▁lab ▁at ▁the ▁University ▁of ▁Illinois . ▁ ▁Many ▁of ▁his ▁books ▁involving ▁mult ivari ate ▁experimental ▁research ▁were ▁written ▁in ▁collaboration ▁with ▁notable ▁colle agues . ▁ ▁F actor ▁analysis ▁C att ell ▁noted ▁that ▁in ▁the ▁hard ▁sciences ▁such ▁as ▁chem istry , ▁physics , ▁astronom y , ▁as ▁well ▁as ▁in ▁medical ▁science , ▁un subst anti ated ▁theories ▁were ▁histor ically ▁w ides p read ▁until ▁new ▁instruments ▁were ▁developed ▁to ▁improve ▁scientific ▁observation ▁and ▁measurement . ▁In ▁the ▁ 1 9 2 0 s , ▁C att ell ▁worked ▁with ▁Charles ▁Spe ar man ▁who ▁was ▁developing ▁the ▁new ▁statistical ▁technique ▁of ▁factor ▁analysis ▁in ▁his ▁effort ▁to ▁understand ▁the ▁basic ▁dimensions ▁and ▁structure ▁of ▁human ▁ab ilities . ▁ ▁F actor ▁analysis ▁became ▁a ▁powerful ▁tool ▁to