Consensus decision-making is a group decision-making process in which group members develop, and agree to support, a decision in the best interest of the whole.
Consensus decision-making is a dynamic way of reaching agreement between all members of a group by ensuring that all opinions, ideas, and concerns are taken into account. In the decision-making process, consensus means looking for "win-win" solutions that are acceptable to every person involved. It is neither compromise nor unanimity; it aims to go further by weaving together everyone's best ideas and key concerns, and is a process that often results in surprising and creative solutions.1
When everyone agrees with a decision, they are much more likely to implement it and stay involved in the long run.
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1https://www.seedsforchange.org.uk/consensus.