We propose a web-based computer-assisted tool for diagnosing progress in international negotiation. The system is based on a general linear model. Innovative features of the program include branching and flipper question to account for the need to address different types of negotiation processes. This paper presents a web-based computer-assisted tool for diagnosing progress in international negotiation. Interviews with professional negotiators revealed a need for assistance in monitoring progress, looking ahead at possible outcomes, facilitating “what … if” scenario analyses as part of planning, and brainstorming for impasse resolution. The tool has been designed to address these functions, among others. Emphasizing flexibility in negotiation, the program identifies five sources for flexible behavior: the parties, the issues, the delegations’ characteristics, the situation, and the process. Sets of questions corresponding to each of these sources are asked to provide informati...