(PERT) A method used to size a software product and calculATe the Standard DeviATion (SD) for risk assessment. The PERT equATion (beta distribution) estimATes the Equivalent Delivered Source Instructions (EDSIs) and the SD based on the analyst' s estimATes of the lowest possible size, the most likely size, and the highest possible size of each computer program component (CPC). (1996-05-29)