This work focuses on consensus formation in multiperson decision-making groups using imprecise information. The editors have solicited and organized contributions on this subject from leading experts in the field. The contributors include Ronald Yager, Henri Prade, George Klier, and Janos Fodor, among others. These contributions are concerned with issues related to modelling and monitoring of consensus-reaching processes under fuzzy preferences and fuzzy majorities. The chapters include an array of paradigms, tools and techniques that can help develop new analytical tools for consensus-reaching processes.