The SimuSolv computer program is an integrated, multi-functional software package designed to help scientists and engineers develop and use mathematical models of physical systems. The behavior of physical systems can be simulated to optimize performance, and to estimate best values for model parameters. SimuSolv used the ACSL (Advanced Continuous Simulation Language) to limit the need for developing extensive computational procedures. Complex models can be developed which are translated into FORTRAN subroutines, then executed by MACROs and the SimiSolv program. SimuSolv is also optimized for graphics output. SimuSolv is a trademark of Dow Chemical Company.