The Undergraduate Year 3 (Junior) Mechanics of Materials rubric is designed to assess students’ understanding of fundamental principles and their ability to apply theoretical knowledge to practical engineering problems. The rubric evaluates key learning outcomes; including stress and strain analysis; deformation under axial; torsional; and bending loads; and the behavior of materials under various loading conditions. By clearly defining performance expectations; the rubric helps students identify strengths and areas for improvement while promoting consistent and objective grading. Students benefit from the rubric’s structured criteria; which emphasize problem-solving skills; analytical reasoning; and the application of concepts such as Hooke’s Law; Mohr’s Circle; and beam deflection. The rubric encourages mastery of core topics by breaking down complex problems into measurable components; ensuring students develop a systematic approach to engineering challenges. Feedback based on the rubric allows students to refine their problem-solving techniques and deepen their comprehension of material behavior under mechanical stress. The rubric also supports the development of technical communication skills by assessing clarity; accuracy; and logical presentation in written solutions. By aligning assessments with course objectives; the rubric ensures students gain proficiency in analyzing and designing structural elements; preparing them for advanced coursework and real-world engineering applications. Overall; the Mechanics of Materials rubric fosters a rigorous learning environment where students can track their progress; engage in self-assessment; and achieve a strong foundation in mechanical engineering principles.