We seek to clarify whether or not nominal GDP targeting (NGDP) may be a suitable tool for the ECB’s monetary policy. We argue that this question really consists of three distinct but related questions: (1) Is it better for the ECB to put more weight on output than it does currently, by switching to a NGDP target? (The theoretical evidence suggests, maybe, but this depends on the distortions faced by the economy.) (2) Should a NGDP (or inflation) target be formulated in rates of growth, or in levels? (The theoretical evidence suggests that a levels target may have some appealing properties, by stabilizing expectations.) (3) What technical issues remain to be addressed? (Issues include the selection of an operating instrument, difficulties in estimating trends, data revisions, and communication.) Altogether, we argue that thinking about nominal GDP targeting in this way might help to clarify what is otherwise a confusing debate.