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ISICS, originally a C language program for calculating K-, L-and M-shell ionization and X-ray production cross sections from ECPSSR and PWBA theory, has been reengineered into a C++ language class, named ISICSoo. The new software design enables the use of ISICS functionality in other software systems. The code, originally developed for Microsoft Windows operating systems, has been ported to Linux and Mac OS platforms to facilitate its use in a wider scientific environment. The reengineered software also includes some fixes to the original implementation, which ensure more robust computational results and a review of some physics parameters used in the computation. The paper describes the software design and the modifications to the implementation with respect to the previous version; it also documents the test process and provides some indications about the software performance. Ionization and X-ray production cross section calculations for ion-atom collisions. Solution method: Numerical integration of form factor using a logarithmic transform and Gaussian quadrature, plus exact integration limits. Reasons for the new version: Capability of using ISICS physics functionality in other software systems; porting the software to other platforms than Microsoft Windows; improved computational robustness and performance. Summary of revisions: Reengineering into a C++ class; several internal modifications to improve correctness and robustness; updated binding energies tabulations; performance improvements. Running time: The running time depends on the selected atomic shell and the number of polynomials used in the Gaussian quadrature integration.

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