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Max Planck Encyclopedia of Public International Law [MPEPIL]

Good Faith (Bona fide)

Markus Kotzur

From: Oxford Public International Law (http://opil.ouplaw.com). (c) Oxford University Press, 2023. All Rights Reserved.date: 24 April 2024

Soft law — General principles of international law — Vienna Convention on the Law of Treaties — Good faith — UN Charter

Published under the auspices of the Max Planck Institute for Comparative Public Law and International Law under the direction of Professor Anne Peters (2021–) and Professor Rüdiger Wolfrum (2004–2020). 

1 The Latin term bona fides, often also used in the inflected forms bonae fidei and bona fide, means good faith. The very wording already discloses a broad intent because of which the bona fides principle—even though being fundamental to more or less every legal system on a world scale—has often been criticized as ambiguous if not amorphous or elusive. However, limiting bona fides to a vague moral dimension or to its self-evident spirit of reasonableness would fall short of comprehending the principle’s historically and philosophically diversified content (see...
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