In1960，DouglasMcGregorsuggestedthetermsoftheoryXandtheoryYinhismanagementbook.TheoryXhadthreesystems，givingalittleornotrusttosubordinatesrespectively.TheoryY，onthecontrary，hadcompletetrustandconfidenceinsubordinates.Themanagercouldusethesetwodifferenttheoriestodistinguishemployeemotivations.