Halliday & Matthiessen (1999: 2):
… our own approach, both in theory and in method, is in contradistinction to that of cognitive science: we treat “information” as meaning rather than as knowledge and interpret language as a semiotic system, and more specifically as a social semiotic, rather than a system of the human mind. This perspective leads us to place less emphasis on the individual than would be typical of a cognitivist approach; unlike thinking and knowing, at least as these are traditionally conceived, meaning is a social intersubjective process. If experience is interpreted as meaning, its construal becomes an act of collaboration, sometimes of conflict, and always of negotiation.