English: This article reports on how text-based synchronous and asynchronous modes of communication in Blackboard were employed at tertiary level to encourage students to share their perceptions of academic writing and sensitise them to the writing process. Employing a computer-mediated discourse analytic (CMDA) framework, three research questions were posed: What were the discussion topics in each mode of computer-mediated communication (CMC)? What types of knowledge construction were reflected in each mode? What kinds of discourse features were generated in each mode? The overall conclusions reached were that both modes of CMC reflected conceptual moves, although few theoretical ideas were present in asynchronous CMC and none in synchronous CMC. Asynchronous CMC was also more syntactically complex than synchronous CMC. This preliminary study suggests that both modes may help learners achieve the above aims.