A related but different extension to singledomain dialogues is multi-domain dialogues, where each domain is handled by a separate agent (Lison, 2011;Gasic et al., 2015a,b;Cuayáhuitl et al., 2016).
to compositedomain dialogues studied in this paper, a conversation in a multi-domain dialogue normally involves one domain, so completion of a task does not require solving sub-tasks in different domains.