Any workable agreement will require Iran to renounce uranium enrichment above the 5% level needed for a civilian nuclear-power program; accept limits on enrichment volumes, the number of centrifuges, and technology; agree to forgo reprocessing; and address operations at the heavy-water reactor in Arak. The third issue concerns supervision and monitoring, which for quite some time would probably have to go beyond that agreed in the Additional Protocol to the NPT and include certain military installations.