Socio-linguistic studies of bilingualism for the most part focus on the linguistic aspects of the problem. Having discovered that speakers alternate between what, from a linguistic point of view, constitute grammatically distinct systems, investigators then proceed to study where and under what conditions alternants are employed, either through surveys in which speakers are asked to report their own language usage (Fishman, 1965), or by counting the occurrence of relevant forms in samples of elicited speech. The assumption is that the presence or absence of particular linguistic alternates directly reflects significant information about such matters as group membership, values, relative prestige, power relationship, etc.