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Data on the natural acquisition of sign language occurring in deaf children of deaf parents were obtained through observation of 10 deaf children (9- to 75-months-old). Short biographical sketches were compiled for each S from the parents' family history. The children tested on a cortical audiometer as severely to profoundly hearing impaired. Over a 2-year period, a data base of 80 video tapes and 4,855 utterances has been established. Four analyses of the data have been begun on such topics as the pointing actions of a 3-year-old and the use of negation by a 2- and a 3-year-old child. (GW)