Philip Glenn, Laughter in interaction. Cambridge: Cambridge University Press, 2003. Pp. xi, 190, Hb $75.00.

Drawing on extant research in conversation analysis (CA) and other fields, Glenn's entry in the “Studies in Interactional Sociolinguistics” series is both an excellent introduction to CA for those outside the field and an interesting exploration of the social phenomenon of laughter. The first chapter gives a general survey of the research, which has often focused on the physicality of laughter and its relation to humor. Ultimately, however, the chapter suggests a function of laughter beyond expressing amusement: affiliation with co-participants in social interaction. In chap. 2, Glenn provides a helpful outline of CA. He emphasizes CA's focus on participants' perspectives and provides a cogent explanation for CA's meticulous transcription conventions with the example of silences, marked on CA transcripts in tenths of seconds. To leave them out, he argues, would be to assume from the beginning that silences in talk mean nothing (p. 37) – an idea that most competent talkers, let alone CA researchers, would reject out of hand.