“…Interactivity in existing NTSs ranges from passive user interaction (such as a personalized voice-overs that articulate the negotiator's thoughts at each step [9]), or scripted interaction (where participants can choose their speech acts from a set of options in a menu [13]), to no textual input at all [22]. Others choose semi-interactive methods, in which participants react to an offer by selecting an option -i.e., accept, propose a counter-offer, or walk away -complement by argumentation, either in written or verbal format [40]. Design choices on interactivity levels mainly depend on the research narrative, the desired level of control, and technical feasibility [36].…”