This chapter talks about the term coordination to refer to coordination-as-convergence. It reviews empirical work on and extends theoretical explorations of the emergence of interpersonal coordination between verbal and nonverbal systems during interaction. The chapter highlights four theoretical perspectives on coordination: communication accommodation theory, interactive alignment theory, partner-specific adaptation, and synergies. It discusses the feature of Cross-recurrence quantification analysis (CRQA) that can handle discrete and continuous signals. This chapter examines the series of experiments that feature CRQA as a measure of coordination across verbal and nonverbal systems, highlighting the ways in which different levels and systems constrain and influence one another during communication. It provides a guide to theories and analyses of verbal coordination to ground the new interest in the history of investigations into how and why individuals affect one another's communicative behaviours. The diverse behaviours that contribute to communication are distributed across multiple timescales and across physical, cognitive and social systems.