The theme of this work is how the negotiation of context in computer mediated conversation is based on empirical evidence of social cooperation, as participants in an interactive event interpret utterances based on their definitions of what is happening at the moment of interaction. The objective is to see how the contextualization cues used by the actors involved in the activity type discussion forum collaborate to learning processes. To get this objective, we used the theoretical assumptions by John Gumperz (1999) about contextualization conventions and contextualization cues, the notions of context by Duranti and Goodwin (1992), and the notion of activity type by Levinson (1992). The results indicated that the inferential process is negotiated in conversation, being built in the social relationships and in the interaction. The examples used in this study show that contextualization cues are activated in the activity type, defining the meaning through inferences.