PAK – Structural Analysis programs for linear and nonlinear structural analysis, heat conduction, fluid mechanics with heat transfer, coupled problems, biomechanics, fracture mechanics and fatigue. Program PAK is of level of world known packages for structural analysis. Built-in finite elements and material models according to the state-of the art theoretical achievements. Original methodology based on the published papers in the world known journals and in the books of the program authors, especially in the field of elastoplastic analysis, thermo-plasticity, anisotropic material behaviour, element enhancements, original finite elements, coupled problems, biomechanics…