DAMSL – Dialog Act Markup in Several Layers – `defines a set of primitive communicative actions that can be used to analyze dialogs’. The structure of DAMSL is the result of work by the Multiparty Discourse Group at the [#DRI DRI] meetings. SWBD-DAMSL was “designed as an augmentation to the [DAMSL] tag-set”, for the purpose of annotating (a portion of) the Switchboard corpus. A page of links to online papers is available here. Some dialogues in the TRAINS Project have been marked up using DAMSL annotation – pointers here. There is also a dialog annotation tool called dat.