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SYSTEM is a program which is developed for the analysis of lumped nonlinear systems. This package consists of about 700 Fortran IV statements and requires approximately 50 kbytes of memory on an IBM 360/75 computer. The low memory requirements of this versatile program compared to other well known programs makes it especially useful for student use. Its highly modular structure enables the users to experiment with several formulation and solution procedures. SYSTEM also provides sensitivity response for parameter variations, a feature highly desirable for automated design of systems.