Language samples were gathered from two children, from several weeks after the first birthday of each child to the beginning of the child's two-word period (approximately 10 months). The children were observed and videotaped every two weeks, to obtain 33 continuous minutes of tape. Analyses focused on the question of whether or not the child uses a "grammar" at the holophrastic (one-word-sentence) stage of development. Results indicated that a grammar was in fact being used, with single words incorporated into a basic logical structure that meaningfully related elements in the environment. (The data-analysis form and the language-functions of individual words in each subject's lexicon are included as appendixes.) (AA)