This thesis explores one aspect of the relationship between sex and language. Twenty pairs of eleven and twelve year old children were tape-recorded during two discussion tasks. Quantitative and qualitative analyses of the data were carried out to investigate to what extent previously reported sex differences in interactional style could be observed in this group of New Zealand school children. Particular attention was paid to the relationship between such differences and the way in which children learn through talk in peer discussion. Two general hypotheses were tested: (i) that girls would tend to use a more collaborative, polite, and affiliative style of interaction, while boys would tend to use a more competitive, task-oriented style, p...