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An additional round of talks between the P5+1 and Iran about the nuclear issue is due to take place in Baghdad in May. Despite a decade of unproductive dialogue, it is important to both sides that negotiations take place: Iran seeks to prevent even harsher sanctions, while President Obama wishes to postpone difficult decisions at least until after the presidential elections. Both parties want to prevent an Israeli strike.

Although the opening positions were worlds apart, negotiations are designed to narrow this divide. In any possible deal, the assumption is that Iran will be granted legitimacy to enrich uranium on its soil. Thus, the difference between a "good deal" and a "bad deal" lies in parameters of Iran's enrichment that would prevent it from breaking out towards nuclear...