The continuum damage mechanics (CDM) model by Talreja [Talreja R. Damage characterization by internal variables. In: Pipes RB, Talreja R, editors. Comput Mater Series, vol. 9. Dam Mech Comp Mater, Elsevier, Amsterdam; 1994, p. 53–78], which is one of the most efficient for damaged laminate stiffness determination, is analyzed using earlier developed theoretical framework which links the macro-response of a damaged laminate to the opening and sliding displacements of crack surfaces in an exact form. The physical meaning of the ma terial parameters in CDM is revealed. Exact expressions for these parameters are derived and transformation rules with changing layer orientation angle presented. terial parameters in CDM is revealed. Exact expressions for these parameters are derived and transformation rules with changing layer orientation angle presented.