"Measure for Measure"'s exploration of moral and ethical issues has ensured its wide popularity among modern readers and theatregoers. This new edition sets the play in its historical context, examining Shakespeare's treatment of a well-known story already modified by Cinthio and Whetstone, and explaining the marriage customs that play a pivotal role in the action. The volume also provides a detailed commentary throughout the text of the play, and a guide to productions of the play, including recent interpretations at Stratford.