His research framework led, in the words of Ernest Gellner, to a minor revolution which consisted of turning ethnography into the study of "Ethnos-es", often referred to as ethnicity by Western anthropologists.
The term Ethnos has such a broad definition to prevent anthropologists from limiting their scopes to small, backwards communities, but instead view people as a whole.
Bromley states the main task of the word Ethnos is to define the common, generic name of community formations such as “tribe”, “nationality” and “nation” Bromley also states that all Ethnoses are unique for each possess a certain internal unity and specific features that distinguish themselves from other communities.
Bromley also claimed that racial distinctions as a whole do not play any essential ethno-distinctive role, and that there are no "pure" racially unmixed people as by the absence of clearcut anthropological boundaries between contiguous peoples or ethnoses belonging to one of the major races.
According to Bromley's framework, race does not matter when viewing the community structure as a whole, and racial purity is impossible.