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2. The term “reasonable”—as opposed to reasonableness, for instance—is used to reflect the terms actually used by international courts.

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4. A significant number of decisions by international arbitration tribunals have also been considered. However, the decisions of the ECJ have not been examined.

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8. Our translation: Salmon, “Les notions à contenu variable en droit international public”, in Perelman and vander Elst, idem, p.265.

9. Salmon, , “Le fait dans l'application du droit international” (1982) 175 Collected Courses of the Hague Academy of International Law 306: what is reasonable “implique une évaluation qui échappe à vrai dire au droit”.Google Scholar

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14. Art. 14 reads: “The enjoyment of the rights and freedoms set forth in this convention shall be secured without discrimination on any ground such as sex, race, colour …”

15. Certain aspects of the laws on the use of languages in education in Belgium, Ser.A, No.6, 23 07 1968, p.34, para.10.Google Scholar

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17. Our translation; Levy-Bruhl, idem, pp.76–77.

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