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This work is focused on the identification of mechanical properties of a composite from tension, compression and bending tests according to ASTM standards. Selected stiffness and strength parameters were identified. The composite, which was made from KORDCARBON-CPREG-200-T-3K-EP1-42-A prepreg, consists of woven fabric (twill) with carbon fibres and epoxy resin. Some of the parameters were identified using the numerical simulation of the tests in the finite element system Abaqus and using optimization algorithms of Isight software. The whole process of the identification was managed by scripts written in Python software.