Title: MuPAD - An Open Computer Algebra System and its Approach of Software Integration Authors: Ralf Hillebrand, Frank Postel The talk gives a brief introduction to the general purpose Computer Algebra System MuPAD and its concepts of domains and using library packages and the technology of dynamic modules for flexible and efficient software integration in MuPAD. With dynamic modules, simple C or C++ functions as well as complete software packages can be linked into MuPAD. This is a very flexible and efficient alternative to interprocess communication for many applications. We present some examples: integrating C/C++ code for numerical calculations (Singular), using MP / Singular for polynomial computations and using PVM for distributed computations (macro parallelism).