A set of procedures for coding internal state words (those words representing mental states and perceptual experiences), developed for application to data on the language of young children and those with whom they converse, is described in this report. The report first discusses the rationale for studying cultural variation in vocabulary use, the cognitive consequences of vocabulary growth, and the rationale for studying internal state words. The following procedures used for coding words are then described: determination of the proportion of each speaker's total tokens at home and at school that were internal state tokens and the proportion that occurred in each of three domains (cognitive, perceptual, and affective), the coding of the tokens for "semanticity" (the relation of the word's meaning to the meaning of the utterance as a whole), and the assignation of a dictionary definition to each semantic token. Sample dialogues between children and adults are then presented to illustrate possible categories to which mental state words can be assigned. The report includes numerous tables of data on such topics as categories of internal state vocabulary, distributions of internal state tokens for individual children, and categorizations of specific internal state words used. (GT)