78 Advances in spoken discourse analysis
more delicate, though, as we have argued above, less rigorously defined,
categories proposed by other analysts.
‘Exchange structure’ is a revised version of Coulthard and Brazil (1979)
Exchange Structure. The first and third sections appear very much in their
original form but the second section, ‘Further observations on exchange
structure’, has been quite radically modified because it was concerned with
introducing the Brazil description of intonation, which is now presented in
detail in Chapter 2 above.