“…Few syntacticians, typologists, or functional grammarians actually define this term, assuming, one supposes, that it is generally understood. Many use it interchangeably with 'topic', as do Dixon (1994) and Du Bois (1987), for example; some use it in the sense in which others use 'topic', as do Brown and Yule (1983:135) and Longacre (1996). Grimes (1975:103 and 324) uses it in a number of ways, including as the starting point of the message, as the topic, and as an element of the organization of the text; and to confuse matters, he uses the terms in ways standard to non-linguistic fields (such as 'topic sentence') but inconsistently with his discussion.…”