The document provides an overview of investor-state arbitration (ITA). It discusses how ITA arose as a means for foreign investors to directly bring claims against host states for treaty violations, rather than having to rely on litigation in domestic courts or diplomatic protection from their home state. It outlines the typical structure of investment treaties and substantive protections they provide, such as for fair and equitable treatment and expropriation. It also describes procedural protections like dispute resolution clauses that allow investors to choose arbitration forums including ICSID or UNCITRAL. The document examines issues like what constitutes a protected investment and ICSID jurisdiction over disputes. It questions whether ITA is achieving its goals and discusses criticisms of the system.