In learning a second language, the student should not only learn the native speaker's patterns of phonology, morphology, and syntax; but he should also internalize the native speaker's collective view of the universe and the appropriate related behavior patterns, both linguistic and nonlinguistic. Languages divide reality into different categories, and, in learning a second language, there may be interference from the native language in understanding the new categories. Linguistic anthropologists have been mapping out categories of cultural phenomena and performing an analysis of the semantic component, using such devices as the paradigm, the taxonomy, and distributional analysis to discover the system of knowledge built up around a people's view of the world. In language instruction, lexical categories should receive systematic treatment and should be brought under the student's control on his route to native-like fluency in a foreign language. (VM)