This article presents partially a doctoral research focused on the instrumental appropriation of a text genre - the complaint letter - throughout the Sociodiscursive Interationism (ISD) theoretical and methodological perspective. The focus in this study concentrates on the approach of the first genre use outline - the textual production context -, from a discursive point of view. So, the concept of action capacity is settled as category of analysis of the text genre in teaching-learning Portuguese situation. The article points at two analytical moments: the action capacity didactization in the didactic sequence project developed by the field research; the development of this capacity from the crossing of the initial and the final production of a complaint letter of one student. The results show the relation between the outcome of the student's production and the didactic intervention towards this genre use outline.
Text context of production; Action capacity; Didactic sequence
