1. A method for evaluating an effectiveness of a prompt sequence played by an interactive voice response system, the prompt sequence containing a plurality of separate phrases, the method comprising: by an interactive voice response computer, playing the prompt sequence to a caller; by the interactive voice response computer, receiving an indication of a caller event during the playing of the prompt sequence, the indication including a timestamp; by the interactive voice response computer, calculating a shifted timestamp by compensating the timestamp for at least one of a system processing time and a caller reaction time; by the interactive voice response computer, mapping the shifted timestamp to a particular phrase of the plurality of separate phrases; and evaluating the effectiveness of the particular phrase based on the mapping of the shifted timestamp.