This article presents a study about several linguistic mechanisms that regulate the production of discourse and the effects achieved. Five discourses which have been delivered between 2005 and 2011 are examined about different areas. Our purpose is to analyse discourse as a linguistic act, to outline the processes involved in this activity and to describe the mechanisms employed in the construction of the text. The results indicate that the discourse, as a communicative act is a complex cognitive activity. The language resources and the sociocultural and psycholinguistic conditions help the writer and the receiver with the tasks of encoding and decoding, respectively, coherent messages, both lasting and emotional.