The early acquisition of the interrogative system, with data from Serbo-Croatian, is investigated. The subject is approached from the angle of adult-child interaction. A first-born pair of dizygotic twins were observed, beginning a month prior to the time when they first began to produce questions. (Author/RM)

Six children were visited in their homes every 2 weeks for 18 months from the age of 6 months to observe their developing comprehension and production of words. Results showed both similarities and individual differences in patterns of early comprehension. A close relationship was noted between early production and comprehension of words;…