A method comprising； receiving, with a processing unit, a torso-surface potential signal from each of a plurality of electrodes distributed on a torso of a patient； for at least a subset of the plurality of electrodes, calculating, with the processing unit, a torso-surface activation time based on the signal sensed from the electrode, and presenting, by the processing unit, to a user, an indication of a degree of dyssynchrony of the torso-surface activation times via a display.
