"On July 14, 2015, Iran and the six powers that have negotiated with Iran about its nuclear program since 2006 (the United States, the United Kingdom, France, Russia, China, and Germany--collectively known as the P5+1) finalized a Joint Comprehensive Plan of Action (JCPOA). The JCPOA is intended to ensure that Iran's nuclear program can be used for purely peaceful purposes, in exchange for a broad lifting of U.S., European Union (EU), and United Nations (U.N.) sanctions on Iran. The JCPOA largely reflects what was agreed in an April 2, 2015, framework for the accord. The agreement replaces a Joint Plan of Action (JPA) interim nuclear accord in operation since January 2014. The Administration and the other P5+1 governments assert that the JCPOA represents the most effective means to ensure that Iran cannot obtain a nuclear weapon, and that all U.S. options to prevent Iran from developing a nuclear weapon remain available even after the key nuclear restrictions of the JCPOA expire. The Administration further asserts that the JCPOA contains provisions for U.N. sanctions to be reimposed if Iran is found not in compliance with its requirements, although the Administration and many experts acknowledge it is difficult to predict the degree to which international governments might reimpose their sanctions."
CRS Report for Congress, R43333
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html