Law that prescribes the procedures and methods for enforcing rights and duties and for obtaining redress (e.g., in a suit). It is distinguished from substantive law (i.e., law that creates, defines, or regulates rights and duties). Procedural law is a set of established forms for conducting a trial and regulating the events that precede and follow it. It prescribes rules relative to jurisdiction, pleading and practice, jury selection, evidence, appeal, execution of judgments, representation of counsel, costs, registration (e.g., of a stock offer), prosecution of crime, and conveyancing (transference of deeds, leases, etc.), among other matters.
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In context of procedural law; procedural rights may also refer not exhaustively to rights to information, rights to justice, rights to participation which those rights encompassing, general Civil and Political rights. In environmental law, these procedural Rights have been reflected within the UNECE Convention on "Access to Information, Public Participation in Decision-making and Access to Justice in Environmental Matters" known as the Aarhus Convention (1998).
The standardization for the means by which cases are brought, parties are informed, evidence is presented, and facts are determined is intended to maximize the fairness of any proceeding. Nevertheless, strict procedural rules have certain drawbacks. For example, they impose specific time limitations upon the parties that may either hasten or (more frequently) slow down the pace of proceedings. Furthermore, a party who is unfamiliar with procedural rules may run afoul of guidelines that have nothing to do with the merits of the case, and yet the failure to follow these guidelines may severely damage the party's chances. Procedural systems are constantly torn between arguments that judges should have greater discretion in order to avoid the rigidity of the rules, and arguments that judges should have less discretion in order to avoid an outcome based more on the personal preferences of the judge than on the law or the facts.
Legal procedure, in a larger sense, is also designed to effect the best distribution of judicial resources. For example, in most courts of general jurisdiction in the United States, criminal cases are given priority over civil cases, because criminal defendants stand to lose their freedom, and should therefore be accorded the first opportunity to have their case heard.
In Germany the expressions formelles / materielles Recht have been developed in the 19th century, because only during such time the Roman actio has been split into procedural and substantive components.
In Germany the unity of procedure and substance in the actio definitely has been brought to an end at the codification of the Bürgerliches Gesetzbuch (BGB) which came into force on January 1, 1900. The expression Anspruch (§ 194 of BGB) - meaning "claim" - has been "cleared" from procedural elements. And this was the time for "founding" the terms formelles / materielles Recht. However, after World War II the expression formelles Recht obviously has been found "contaminated" and to a broad extent has been replaced by Prozeßrecht meaning narrowing the idea behind it to "law of litigation" (thereby excluding f.i. the law of other procedures and the law on competences).