Reasonableness

The concept of reasonableness has two related meanings in law and political theory:

As a legal norm, it is used "for the assessment of such matters as actions, decisions, and persons, rules and institutions, [and] also arguments and judgments." As a regulative idea, it "requires... that all factors that might be relevant in answering a practical question be considered and... that they be assembled in a correct relation to each other in order to justify [a judgement]."

Reasonableness should not be conflated with rationality.

Political theory Reasonableness has been discussed by political thinkers such as John Rawls (in his 1993 Political Liberalism), T. M. Scanlon, Brian Barry and Georg Henrik von Wright.

Law The notion of "reasonableness" is omnipresent in European law, and has also affected "international treaties and general customs". Examples of its use can be found in canon and medieval law, suggesting roots going back to Ancient Rome.

Standards and doctrines Standards and doctrines requiring reasonableness include:

Reasonability Reasonable accommodation Reasonable actThomas Johnson Michie. "Reasonable-Reasonably". Garland and McGehee (eds). The American and English Encyclopaedia of Law. Second Edition. Edward Thompson Company. 1903. Volume 23. Pages 946 and 947 Reasonable appearance of danger Reasonable careGarland and McGehee (eds). "Reasonable Care". The American and English Encyclopaedia of Law. Second Edition. Edward Thompson Company. 1903. Volume 23. Pages Page 947. Reasonable cause or reasonable and probable causeWood Renton and Robertson (eds). Encyclopaedia of the Laws of England. 2nd Edition. 1908. vol 12. p 378. Reasonable and competent support Reasonable creature Reasonable danger Reasonable diligenceGarland and McGehee (eds). "Reasonable Diligence". The American and English Encyclopaedia of Law. Second Edition. Edward Thompson Company. 1903. Volume 23. Pages Page 947. Reasonable doubt Reasonable expectation (Legitimate expectation is sometimes called reasonable expectation.)Alexander Brown, A Theory of Legitimate Expectations for Public Administration, Oxford University Press, 2017, p 4. Reasonable facilities Reasonable fitness Reasonable mind Reasonable and non-discriminatory licensing Reasonable person (or reasonable man) Reasonable person model Reasonable portion Reasonable possibility Reasonably practicable Reasonable and probable damage Reasonable and probable grounds Reasonable provocation Reasonable prudence Reasonable question Reasonable rates Reasonable regulation Reasonable right of way Reasonable skillGarland and McGehee (eds). "Reasonable Skill". The American and English Encyclopaedia of Law. Second Edition. Edward Thompson Company. 1903. Volume 23. Pages Page 971. Reasonable suspicion Reasonable timeThomas Johnson Michie. "Reasonable Time". Garland and McGehee (eds). The American and English Encyclopaedia of Law. Second Edition. Edward Thompson Company. 1903. Volume 23. Pages Page 971. Reasonable use Reasonable wear and tear excepted Subjective and objective standard of reasonableness

Constitutional and administrative law In constitutional and administrative law, reasonableness is a lens through which courts examine the constitutionality or lawfulness of legislation and regulation. According to Paul Craig, it is "concerned with review of the weight and balance accorded by the primary decision-maker to factors that have been or can be deemed relevant in pursuit of a prima facie allowable purpose".

Common law Examples of reasonableness standards in common law jurisdictions include:

Reasonableness simpliciter and patent unreasonableness (repealed in 2008) in Canadian law Wednesbury unreasonableness in English law Wednesbury unreasonableness in Singaporean law

Mixed jurisdictions Reasonableness cause in Israeli law (עילת הסבירות) Reasonableness in South African administrative law

Reasonability

Reasonability is a legal term. The scale of reasonability represents a quintessential element of modern judicial systems and is particularly important in the context of international disputes and conflicts of laws issues. The concept is founded on the notion that all parties should be held to a reasonable standard of conduct and has become embedded in a number of international conventions such as the UNIDROIT principlesTeramura. "Demonstrating reasonableness". Ex Aequo et Bono as a Response to the ‘Over-Judicialisation’ of International Commercial Arbitration. 2020. and the CISG.Article 8 United Nations Convention on Contracts for the International Sale of Goods

The concept of reasonability is applicable to Roman law.Frier, "Case 98: Reasonability", A Casebook on the Roman Law of Contracts, OUP, 2021, p 223. María José Falcón y Tella, Case Law in Roman, Anglosaxon and Continental Law, 2011, pp 138 to 140.

Reasonableness

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