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Procedural justice concerns the fairness of the processes by which decisions are made--as contrasted with the distributive justice (fairness in the distribution of rights or resources) and corrective justice (fairness in the rectification of wrongs). Some theories of procedural justice hold that a fair procedure can render the outcomes it produces just, even if they do not satisfy the requirements of distributive or corrective justice.
In A Theory of Justice, the philosopher John Rawls distinguished three ideas of procedural justice:
The theory of procedural justice is controversial, with a variety of views about what makes a procedure fair. These views tend to fall into three main families, which can be called the accuracy model, the balancing model, and the participation model.
The idea of the outcomes model of procedural justice is that the fairness of process depends on the procedure producing correct outcomes. For example, if the procedure is a criminal trial, then the correct outcome would be conviction of the guilty and exonerating the innocent. If the procedure were a legislative process, then the procedure would be fair to the extent that it produced good legislation and unfair to the extent that it produced bad legislation.
Some procedures are costly. The idea of the balancing model is that a fair procedure is one which reflects a fair balance between the costs of the procedure and the benefits that it produces. Thus, a balancing approach to procedural fairness might accept erroneous verdicts in order to reduce the costs of criminal process.
The idea of the participation model is that a fair procedure is one that affords those who are affected an opportunity to participate in the making of the decision. In the conxtext of a trial, for example, the participation model would require that the defendant be afforded an opportunity to be present at the trial, to put on evidence, cross examination witnesses, and so forth.
The idea of procedural justice is especially influential in the law. In the United States, for example, a concern for procedural justice is reflected in the Due Process clauses of the United States Constitution. In other common law countries, this same idea is sometimes called natural justice.