CATIA V5R21 for Designers introduces the reader to CATIA V5R21, one of the world's leading parametric solid modeling packages. In this textbook, the author emphasizes on the solid modeling techniques that enhance the productivity and efficiency of the user. This textbook consists of 16 chapters followed by Student-Projects structured in a pedagogical sequence, covering the Part Design, Assembly Design, Drafting, Wireframe and Surface Design, Generative Sheetmetal Design and DMU Kinematics workbenches of CATIA V5R21. A Command Section is given at the introduction of each tool that provides information about the method of invoking the corresponding tool. The text is followed by tutorials that are created using various commands explained in it. This approach allows the users to use this textbook as a learning tool as well as a reference material.