An International Investment Agreement (IIA) is a type of treaty between countries that addresses issues relevant to cross-border investments, usually for the purpose of protection, promotion and liberalization of such investments. Most IIAs cover foreign direct investment (FDI) and portfolio investment, but some exclude the latter. Countries concluding IIAs commit themselves to adhere to specific standards on the treatment of foreign investments within their territory. IIAs further define procedures for the resolution of disputes should these commitments not be met. The most common types of IIAs are Bilateral Investment Treaties (BITs) and Preferential Trade and Investment Agreements (PTIAs). International Taxation Agreements and Double Taxation Treaties (DTTs) are also considered as IIAs,