The present work is focused on the potential impacts of a Decision Support System (DSS) on emotional behaviors in text-based based online negotiations. Strictly speaking, we are dealing with a Negotiation Support System (NSS), which consists of a DSS component provided to each negotiator and an electronic communication component that allows the negotiators to communicate with each other (Lim & Benbasat, 1992-93). If such a NSS is deployed online and used via the Internet it is sometimes also referred to as an Electronic Negotiation System (ENS; Vahidov et al., 2013).