When I used to examine for Cambridge, 'turn-taking' was the term used for what you've described.
References follow

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Note added at 41 mins (2008-04-27 08:18:06 GMT)
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"The nature by which a conversation is done in and through turns. Turn-taking is one of the fundamental organizations of conversation. According to CA, the turn-taking system consists of two components: the turn constructional component and the turn allocational component. The turn-taking organization is described in Sacks, H., Schegloff, E. A., & Jefferson, G. (1974). A simplest systematics for the organization of turn-taking for conversation. Language, 50, 696-735."
( and ff. http://tinyurl.com/5w9ndu )

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Note added at 42 mins (2008-04-27 08:19:37 GMT)
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"This article provides an empirically grounded
account of what happens when more persons than
one talk at once in conversation. It undertakes
to specify when such occurrences are problematic
for the participants, and for the organization of
interaction; what the features of such overlapping
talk are; and what constraints an account of
overlapping talk should meet. It describes the
practices employed by participants to deal with
such simultaneous talk, and how they form an
organization of practices which is related to the
turn-taking organization previously described by
Sacks et al. 1974. This “overlap resolution
device” constitutes a previously unexplicated
component of that turn-taking organization, and
one that provides solutions to underspecified
features of the previous account."
( http://tinyurl.com/625hpp )


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Note added at 46 mins (2008-04-27 08:23:37 GMT)
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"Abstract:
This paper will focus on the turn-taking patterns of Deaf signers and will compare them with turn-taking patterns found in spoken interaction. Turn-taking in the conversation of hearing people has been the subject of considerable attention, but the way conversation is organised by Deaf conversationalists has received less attention. This paper reports on a small project involving conversational data obtained from two Deaf friendship groups, one all-female and one all-male. Our main aim was to establish whether Deaf interactants orient to a one-at-a-time model of turn-taking, or whether there was any evidence to suggest they can also orient to a more collaborative model. It has been assumed by researchers in the field of Deaf Studies that Deaf interactants orient to a one-at-a-time model since, where the medium of communication is visual rather than sound based, participants can attend to only those sources of talk that they can see. The paper also examines the data to see if there are any gender differences in the way Deaf interactants organise conversation. "
( http://tinyurl.com/6964l2 )

http://tinyurl.com/5zc526
http://tinyurl.com/5dx8k2