Consensus Methods in Group Decision-Making
Summary
Consensus methods lie at the heart of collaborative decision-making processes, seeking to reconcile diverse individual judgments into a single collective outcome. Such methods range from simple voting rules and deliberative protocols to formal aggregation models grounded in social choice theory. Key challenges include balancing fairness, efficiency and strategic resistance, as epitomised by Arrow’s impossibility theorem, which demonstrates that no aggregation rule can satisfy all desirable criteria simultaneously. Advances in computational techniques have enabled rapid convergence to consensus in large and distributed groups, supporting applications in public policy, engineering design and healthcare prioritisation. Empirical studies increasingly combine qualitative deliberation with quantitative scoring to enhance transparency, robustness and stakeholder engagement in both high-stakes and routine decisions.
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Consensus Methods in Group Decision-Making publication trend
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Technical terms
Aggregation model: A formal rule or algorithm that combines individual preferences or judgments into a single collective decision.
Consensus ranking: An ordered list of alternatives representing the collective preference of a group after aggregation.
Arrow’s impossibility theorem: A foundational result showing that no ranking aggregation rule can satisfy all fair-choice criteria simultaneously.
Concordance: A measure of agreement among individual rankings or ratings, often used to assess the coherence of a consensus.
Multi-criteria decision-making: A process in which alternatives are evaluated across multiple, often heterogeneous, criteria before aggregation.
References
- Impossible by design? Fairness, strategy, and Arrow’s impossibility theorem. Design Science (2017).
- A proposal for an operational methodology to assist the ranking-aggregation problem in manufacturing. Research in Engineering Design (2024).
- The selection of COVID-19 epidemic prevention and control programs based on group decision-making. Complex & Intelligent Systems (2022).
- Analysing paradoxes in design decisions: the case of “multiple-district” paradox. International Journal on Interactive Design and Manufacturing (IJIDeM) (2022).
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