the concept of “system of kinship” tended to dominate anthropological studies of kinship in the early 20th century. kinship systems as defined in anthropological texts and ethnographies were seen as constituted by patterns of behavior and attitudes in relation to the differences in terminology, listed above, for referring to relationships as well as for addressing others. many anthropologists went so far as to see, in these patterns of kinship, strong relations between kinship categories and patterns of marriage, including forms of marriage, restrictions on marriage, and cultural concepts of the boundaries of incest. a great deal of inference was necessarily involved in such constructions as to “systems” of kinship, and attempts to construct systemic patterns and reconstruct kinship evolutionary histories on these bases were largely invalidated in later work. however, anthropologist dwight read later argued that the way in which kinship categories are defined by individual researchers are substantially inconsistent. this occurs when working within a systemic cultural model that can be elicited in fieldwork, but also allowing considerable individual variability in details, such as when they are recorded through relative products.