1. A computer program product comprising: a computer usable medium having computer usable program code for simulating a manufacturing process, the computer program medium comprising: a first program module, wherein the first program module creates a discrete event simulation model from process definition data and runs simulations using the discrete event simulation model, wherein the discrete event simulation model includes a current schedule; a second program module, wherein the second program module analyzes task information to generate a schedule; and a third program module, wherein the third program module receives the process definition data for a manufacturing process, sends the process definition data to the first program module to initiate creation of the discrete event simulation model, initiates running of a first simulation using the discrete event simulation model to produce results, sends information from the results and the discrete event simulation model to the second program module to cause the second module to generate a new schedule, sends the new schedule to the first program module to cause creation of a new discrete event simulation model including the new schedule, and initiates running of a second simulation using the first program module to generate new results.