A computer-based method and system to enable a benefit plan sponsor to design a plurality of benefit plans to be offered to a given participant population and for determining the cost of sponsoring the plans for the participant population by predicting utilization for each of the plans based upon historical utilization data for the population, projected plan selections based upon presumed participant objectives, and/or survey or historical data from a sample of the given population or from preexisting statistical samples exhibiting analogous demographic characteristics to the given participant population relating to expected benefit utilization and plan preference criteria.