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Consensus has two common meanings. One is a general agreement among the members of a given group or community. The other is as a theory and practice of getting such agreements (for infomation on the practice of achieving formal consensus, see Consensus decision-making).
Achieving consensus requires serious treatment of every group member's considered opinion. Once a decision is made it is important to trust in members' discretion in follow-up action. In the ideal case, those who wish to take up some action want to hear those who oppose it, because they count on the fact that the ensuing debate will improve the consensus. In theory, action without resolution of considered opposition will be rare and done with attention to minimize damage to relationships.
Consensus as collective thought
A close equivalent phrase might be the "collective opinion" of a group, keeping in mind that a high degree of variation is still possible among individuals, and certainly if there must be individual commitment to follow up the decision with action, this variation remains important. There is considerable debate and research into both collective intelligence and consensus decision making.
This article focuses strictly on the idea of consensus in the abstract, not on the implications of consensus for politics or economics, where follow-up action is required.
Consensus usually involves collaboration, rather than compromise. Instead of one opinion being adopted by a plurality, stakeholders are brought together (often with facilitation) until a convergent decision is developed. If this is done in a purely mechanical way it can result in simple trading—we'll sacrifice this if you'll sacrifice that. Genuine consensus typically requires more focus on developing the relationships among stakeholders, so that they work together to achieve agreements based on willing consent.
Models of consensus
The most common and most successful model of consensus is called the prisoner's dilemma. An introduction and discussion of this concept can be found in any contemporary introduction to Political Science. This approach might be called "algebraic" as opposed to analytic, within mathematics, because it represents an agent by a symbol and then examines the algebraic properties of that symbol. For example, the question, "Can two agents be combined to make a new agent?" sounds like an algebraic question. (More formally, "is the operation of consensus closed in the domain of agents? Is there a larger domain of "abstract agents" in which this operation is closed?")
In a more analytic style, we might naively start by envisioning the distribution of opinions in a population as a Gaussian distribution in one parameter. We would then say that the initial step in a consensus process would be the written or spoken synthesis that represents the range of opinions within perhaps three standard deviations of the mean opinion. Other standards are possible, e.g. two standard deviations, or one, or a unanimity minus a certain tolerable number of dissenters. The following steps then operate both to check understanding of the different opinions (parameter values), and then to find new parameters in the multi-dimensional parameter space of all possible decisions, through which the consensus failure in one-dimensional parameter space can be replaced by a solution in multi-dimensional parameter space.
An alternative, qualitative, mathematical description is to say that there is an iterative process through (m+n)-dimensional parameter space, starting from initial guesses at a solution in (m)-dimensional parameter space, which tries to converge to find a common solution in (m+n)-dimensional parameter space.
A criticism of such modelling is that the opinions or agreements are only theoretical, and that the strength or degree of conviction as measured is not closely correlated to the willingness of any given individual to take action. In direct action politics, the consensus is constantly tested by asking those who agree to immediately place their own bodies 'on the line' and in harm's way, to actually demonstrate that they are committed to a consensus. The ecology movement, peace movement, and labor movement have historically required such demonstrations of commitment. Some have disdained any attempt at formal models or methods, but others have prepared extensive documentation on both formal and informal consensus decision making processes.
Typically, the usefulness of formal models of consensus is confined to cases where follow up action is closely and centrally controlled, e.g. in a military hierarchy or a set of similar computer programs executing on hardware that it completely controls. The idea of consensus itself is probably quite different when considering action by a group of independent human agents, or considering action by those taking orders and committed to executing them all without question, or suffering great harm or exile for any disobedience.
Consensus upon a particular formal model of consensus can lead to groupthink, by making it harder for those who reject any that formal model to have their case heard out in informal terms or using a different model. This recursion suggests the extreme complexity of reasoning about consensus in a political context. A classic example is the peace movement's objection to the logic of mutual assured destruction during the Cold War, which reflected the opinions of a few experts in game theory, and directed vast resources into ultimately-useless weapons of mass destruction, which (in the USSR at least) caused the world's worst toxic waste disposal problem to date as its nuclear missiles start to decay. Peace activists found the formal models of escalation and military behavior to be significant barriers when they objected to military spending and long term impacts on the environment. As they had not mastered game theory models they simply were not heard.
As this example suggests, the concept of consensus is a particularly important one in the context of society and government, and forms a cornerstone of the concept of democracy. Democracy, in its rawest form, direct democracy, has been criticized by a significant number of scholars since the time of Plato as well as adherents to strict republican principles, and is sometimes referred to as the "tyranny of the majority", with the implication that one faction of the society is dominating other factions, possibly repressively.
Others, however, argue that if the democracy adheres to principles of consensus, becoming a deliberative democracy, then party or factional dominance can be minimized and decisions will be more representative of the entire society. This too is discussed in depth in the article on consensus decision making, with many actual examples of the tradeoffs and different tests for consensus used in actual societies and polities.
A major cornerstone of the Westminster System is Cabinet Government. All Cabinet decisions are consensual collective and inclusive, a vote is never taken in a Cabinet meeting. All ministers, whether senior and in the Cabinet, or junior ministers, must support the policy of the government publicly regardless of any private reservations. If a minister does not agree with a decision he, or she, can resign from the government; as did several British ministers over the 2003 Invasion of Iraq. This means that in the Westminster system of government the cabinet always collectively decides all decisions and all ministers are responsible for arguing in favour of any decision made by the cabinet.
Business and political analysts have pointed out a number of problems with consensus decision making. A too-strict requirement of consensus may effectively give a small self-interested minority group veto power over decisions. Decision by consensus may take an extremely long time to occur, and thus may be intolerable for urgent matters, e.g. those of executive decisions. In some cases, consensus decision making may encourage groupthink, a situation in which people modify their opinions to reflect what they believe others want them to think, leading to a situation in which a group makes a decision that none of the members individually think is wise. It can also lead to a few dominant individuals making all decisions. Finally, consensus decision making may fail in a situation where there simply is no agreement possible, and interests are irreconcilable.
While each of these scenarios can make consensus harder to reach, there are a number of ways to mitigate each of them. For example, concern that consensus takes longer to achieve has, in many cases proven to be a factor that can be overcome through effective facilitation and group process (see the section of the Consensus decision-making article entitled "The promise of consensus decision-making").
Examples within computing
Within the IETF, the concept of "rough consensus and running code" is the basis for the standardization process. It has proven extremely effective for standardizing protocols for inter-computer communication, particularly during its early years.
In computer science, consensus is sometimes used to refer to the problem of achieving coherency among nodes of a distributed computer system. Achieving consensus is a challenging problem in distributed systems, particularly as the number of nodes grows or the reliability of links between nodes decreases.
Some wiki software can be used as infrastructure for reaching consensus within a project.
"Consensus" may also refer to the Consensus theorems in Boolean algebra.
"Consensus" is a shorthand for Consensus sequence.
Examples of non-consensus
-Interestingly the peer review process in most scientific journals does not use a consensus based process. Referees submit their opinions individually and there is not a strong effort to reach a group opinion.
- Collective intelligence
- Consensus democracy
- Consensus theory of truth
- Copenhagen Consensus
- Major consensus narrative
- Polder model
- Tyranny of the majority
- Libertarian Socialism
- Theory of Consent - in a natural order philosophy
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