Abstract.Abstract.Abstract. This article outlines a three-party conversation corpus built by the National Institute of Information and Communications Technology (Section 2) and introduces three analyses that contribute to the development of ConversationalInformatics:Thefeaturesofturn-takinginthree-personconversation(Section3);assessmentsequential patterns that appeared in the data (Section 4); and shared knowledge and interpersonal relationships between participantsobservablefromtheassessmentsequencesintriadicconversation(Section5). 1 SignificanceofTriadicConversationAnalysis1 SignificanceofTriadicConversationAnalysis1 SignificanceofTriadicConversationAnalysis1 SignificanceofTriadicConversationAnalysis The importance of triadic conversation analysis has begun to be recognized in various research disciplines in Japan in recentyears.Herearethefollowingattemptsofcorpusconstruction,analysisandimplementation: