'These four volumes (4,5,6 and 7) venture into remarkably diverse fields. How one man could master the minutiae of all these areas of linguistic research is a matter for wonder and admiration. As a linguistic polymath, Halliday far outstrips all contemporaries...One need look for no further explanation of Halliday's current stature as doyen of British linguistics. The publication of Halliday's complete papers is an important contribution to scholarly documentation.'
- Roy Harris, Times Literary Supplement