In linguistics, the topic (or theme)'s informally what's being talked about, and the comment (rheme or focus)'s what's being said about the topic. Although this general nature of topic-comment dichotomy's generally accepted, anything beyond that's a matter of great controversy. The distinction was probably first suggested by Henri Weil in 1844. Georg von der Gabelentz distinguished psychological subject (roughly topic) and psychological object (roughly focus). In the Prague school, the dichoto… (More on Topic-comment)