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Abstract Abstract Evaluative studies of CMC can produce misleading or even contradictory results due to an (understandable) focus on how the characteristics of the medium affect usage, ignoring the dialectic between technology and culture, of mutual adaptation over time. CMC exchanges in Higher Education take place within a broad teaching and learning system, of which most participants already have extensive experience. This system provides the context within which participants make sense of, and adapt to, the use of on-line communications. Thus interpretations of the processes shaping exchanges and their outcomes have to take into account: who participants see themselves as communicating with and why, how this serves longer-term learning goals, and what past experience of engaging with both task and audience they have had; what kinds of exchange are facilitated, both by the medium itself and how the task is organised, and how such affordances are honed over time; and also, how these interactions impact on other aspects of teaching and on learning outcomes.

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This paper looks at the typographical resource of written emphasis (changing the typeface style on specific words or passages within text)-for signalling information focus. Some investigations into the effects of two conventional typefaces, upper case and italic, for signalling modulatory and contrastive stress upon word content are reported, illustrating the effectiveness of strategies using this resource for economically transmitting intended content from writer to reader. At this time of heightened interest in writing competence, and the potential of electronic writing systems for providing more typographical resources to the author than were available with pen-and-paper or typewriting modes, the function of paralinguistic signalling within written language is suggested as a key issue for research.'Good communication' is where the intended content of a message matches its interpreted content. The degree of match is, very largely a function of the text-the expression of the content. Halliday's (1985) example of traffic lights is adapted in Figure 1 to provide a simple model of the 'realization' relationship between content, [STOP content+realised

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