Preface -- Part I: Introduction -- Group decision making -- Consensus reaching process -- Part II: Consensus models with the minimum adjustments and aggregation operators -- Minimum adjustments consensus models -- Maximum expert consensus models -- Part III: Consensus in the multiple attribute group decision making -- Consensus rule I: minimizing the distance between original and adjusted preferences -- Consensus rule II: minimizing the number of adjusted preference values -- Interactive multiple attribute consensus framework to support consensus reaching -- Part IV: Consensus in the group decision making with preference relations -- Individual consistency issues in preference relations -- Consensus framework with minimum adjustments to integrate the individual consistency -- Part V: Consensus in the linguistic group decision making -- Linguistic consensus model with minimum adjustments -- Minimizing adjusted simple terms in the hesitant linguistic consensus reaching -- Part VI: Simulation experiments and comparison analysis -- Simulation experiments and comparison analysis -- Appendix.