CA investigates interaction by examining the practices that participants use to construct it.
A 'practice' is any feature of the design of a turn in a sequence that (i) has a distinctive character, (ii) has specific locations within a turn or sequence, and (iii) is distinctive in its consequences for the nature or the meaning of the action that the turn implements.
(a) Turn-initial address terms designed to select a specific next speaker to respond: (Lerner, 2003)
A: Gene, do you want another piece of cake?
Doc: Do you have any other questions?
(c) Oh-prefaced responses to questions primarily conveying that the question was inapposite or out of place: (Heritage, 1998)
Ann: How are you feeling Joyce.=Joy: Oh fi:ne.Ann: 'Cause- I think Doreen mentioned that you weren't so well?