We describe an annotation tool developed to assist in the creation of multimodal actioncommunication corpora from on-line massively multi-player games, or MMGs. MMGs typically involve groups of players (5-30) who control their avatars1, perform various activities (questing, competing, fighting, etc.) and communicate via chat or speech using assumed screen names. We collected a corpus of 48 group quests in Second Life that jointly involved 206 players who generated over 30,000 messages in quasisynchronous chat during approximately 140 hours of recorded action. .
