The development and implementation of a software tool PROMAL' for teaching a course in Mechanics of Composite Materials is presented. The software complements the work on lengthy linear algebra computations for parametric studies and homework assignments. Most important, at the end of the course it allows the students to design and analyze laminated structures and appreciate their applications. PROMAL is both an instructional tool for the instructor and a guide to the student as it shows intermediate steps to the final calculations.