How to understand the Iran nuclear deal timetable?

On Sunday the United States and the European Union took formal steps to open the way to lifting sanctions against Iran, in what was called "adoption day".

But the procedure is still dependant on Tehran meeting the conditions agreed in a landmark nuclear agreement signed in July. Under the deal signed with six world powers, Iran agreed to limit nuclear activities in return for sanctions relief.

This is what the complicated timetable on the deal looks like, in a explainer produced by the BBC's Persian service.

Video produced by Hossein Sharif and Valery Eremenko.