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The authors question how the contradictory anthropological theories of family proffered by Lewis Henry Morgan, Edvard Westermarck, and Robert Briffault could have all been acknowledged as true at different times and in different societies.
John Ferguson McLennan, Lewis Henry Morgan, and others argued that there was a parallel development in social institutions.
Anthropologist Lewis Henry Morgan (1818–1881) performed the first survey of kinship terminologies in use around the world.
The most important factor in his theory is technology: "Social systems are determined by technological systems", wrote White in his book, echoing the earlier theory of Lewis Henry Morgan.