The microplane constitutive model for damage in concrete evolved since 1984 through a series of progressively improved models labeled M0, M1, M2,..., M7. It was also extended to fiber composites (woven or braided laminates), rock, jointed rock mass, clay, sand, foam and metal. The microplane model has been shown to allow close fits of the concrete test data for uniaxial, biaxial and triaxial loadings with post-peak softening, compression-tension load cycles, opening and mixed mode fractures, tension-shear and compression-shear failures, axial compression followed by torsion (i.e., the vertex effect) and fatigue. The loading rate effect and long-term aging creep of concrete have also been incorporated. Models M4 and M7 have been generalized to finite strain. The microplane model has been introduced into various commercial programs (ATENA, OOFEM, DIANA, SBETA,...) and large proprietary wavecodes (EPIC, PRONTO, MARS,...). Alternatively, it is often being used as the user's subroutine such as UMAT or VUMAT in ABAQUS.