Definition
The legal system needs to permit those subject to the law to regulate their conduct with certainty and to protect those subject to the law from arbitrary use of state power. Legal certainty represents a requirement that decisions be made according to legal rules, i.e. be lawful. The concept of legal certainty may be strongly linked to that of individual autonomy in national jurisprudence. The degree to which the concept of legal certainty is incorporated into law varies depending on national jurisprudence. However, legal certainty frequently serves as the central principle for the development of legal methods by which law is made, interpreted and applied.
Legal certainty is an established legal concept both in the civil law legal systems and common law legal systems. In the civil law tradition, legal certainty is defined in terms of maximum predictability of officials' behaviour. In the common law tradition, legal certainty is often explained in terms of citizens' ability to organise their affairs in such a way that does not break the law. In both legal traditions, legal certainty is regarded as grounding value for the legality of legislative and administrative measures taken by public authorities.
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