摘要:This paper presents the theoretical and methodological background which underlies the work conducted over the last decade at IEL/Unicamp by researchers of CNPq project A relevância dos dados singulares para a aquisição da linguagem escrita. The central role attributed to the bakhtinian concept of discourse genres is emphasized, as well as the close relationship between genres and style. Texts representative of two subjects writing acquisition process are presented and discussed as examples of the emergence of style and genre differentiation.