Abstract: A computer-implemented process simulation method or tool that uses a software engine that calculates resources required to complete a project based upon contents of user-defined benefit-trade matrices associated with substeps of the project and design requirement priority values and a sample design whose process is to be simulated. Design requirement priority values and the sample design are input. Each substep is defined using a benefit-trade matrix that comprises a multiple variable lookup table that embodies history data relating to the substep. Each matrix includes relative weights of schedule, cost and risk elements for the substep and user-input rating values corresponding to the importance of each element. A logical equation is defined for each substep that computes the time required to complete the project, required resources for the project, and cost of the project based upon data input thereto.