It was the latter sense of the term that was predominantly adopted and exploited by Melanie Klein. After Freud, "the most important contribution has come from Melanie Klein, whose work enlightens the idea of 'splitting of the object' ("") (in terms of 'good/bad' objects)". In her object relations theory, Klein argues that "the earliest experiences of the infant are split between wholly good ones with 'good' objects and wholly bad experiences with 'bad' objects", as children struggle to integrate the two primary drives, love and hate, into constructive social interaction. An important step in childhood development is the gradual depolarization of these two drives.