Argues that a major difficulty in formalizing linguistic dialogue interaction is the uncertainty arising from various factors. Advances proposals for capturing at least some of those factors in logical representations: topic/subtopic arrangement; semantic allocation; participants' competence; discourse goals; semantic, psychological, and pragmatic…

Indicates a periodic structure in the distribution of between-turn silences in two-party conversation, a finding that is inconsistent with current stochastic or signaling models, which view social interaction as an exchange of stimuli and responses. Finds that social interaction is fundamentally a collaborative activity. (JD)