The present collection of essays gathers contributions written in honour of Professor Ryuichi Ida by his colleagues and former students, covering a variety of fields of international law with particular emphasis upon the context, effectiveness and purposes of international law.

Shotaro Hamamoto, docteur en droit (Paris II), is Professor of the Law of International Organizations at Kyoto University. His recent publications appear, among others, in Ecrits en l'honneur du Professeur Pierre-Marie Dupuy (Brill, 2014) and Liber amicorum Peter Haggenmacher (Brill, 2014).
Hironobu Sakai, LL.M. (Kyoto), is Professor of International Law at Kyoto University. His publications, generally covering the law of international organizations and dispute settlement, appear in many periodicals such as the Asian Yearbook of International Law and the Japanese Yearbook of International Law.
Akiho Shibata, LL.M. (Kyoto and NYU), is Professor of International Law at Kobe University. He widely publishes on international law-making, the Antarctica and international environmental law. His recent publications include International Liability Regime for Biodiversity Damage: The Nagoya-Kuala Lumpur Supplementary Protocol (Routledge, 2014).