How to determine the consensus threshold in group decision making: a method based on efficiency benchmark using benefit and cost insight

Abstract In the past 10 years, a large number of consensus-reaching approaches for group decision making (GDM) have been proposed. While these methods either focus on cost consensus reaching or convergency process, efficiency has long ignored. Meanwhile, measurements threshold are often determined by some subjective and intuitive judgements, such as management experience estimations degree satisfaction, which lack theoretical foundation. applications, how to measure evaluate method also ambiguous. To tackle questions, we introduce measures into process GDM achieve comprehensive evaluation current through an analysis costs improvement. From perspective efficiency, propose benchmark in data envelopment without explicit input models, then present objective determination GDM. Finally, use numerical examples illustrate usability our method.