The ICSID Reports provide an authoritative collection of investor-State arbitral awards rendered under the auspices of the World Bank's International Centre for Settlement of Investment Disputes (ICSID) and other institutions. These decisions, which are fully indexed, make an important contribution to the growing body of jurisprudence on international investment law. The ICSID Reports are an invaluable tool for practitioners, scholars and government lawyers working in the field of public international law, investment treaty arbitration, and international commercial arbitration, whether advising foreign investors or States. Volume 19 of the ICSID Reports focuses on The Meaning of Investment, including an opening piece on the unity of investment by leading scholar and arbitrator Professor Christoph Schreuer and an overview of subject-matter jurisdiction by Professor Michael Waibel. Volume 19 of the ICSID Reports includes summaries, digests and excerpts of decisions rendered between 2004 and 2016 in 21 cases: Mitchell v. DRC, Malaysian Historical Salvors v. Malaysia, Bayview v. Mexico, Biwater Gauff v. Tanzania, Quasar de Valors v. Russia, Phoenix Action v. Czech Republic, Romak v. Uzbekistan, Fakes v. Turkey, Global Trading Resource v. Ukraine, HICEE v. Slovakia, Abaclat v. Argentina, Caratube v. Kazakhstan, Deutsche Bank v. Sri Lanka, Standard Chartered Bank v. Tanzania, Ambiente Ufficio v. Argentina, AES v. Kazakhstan, Enkev Beheer v. Poland, Postova banka v. Greece, Gavazzi v. Romania, and MNSS v. Montenegro.