Assessing student learning outcomes relative to a valid and reliable standard that is academically-sound and employer-relevant presents a challenge to the scholarship of teaching and learning. In this paper, readers are guided through a method for collaboratively developing and validating a rubric that integrates baseline data collected from academics and professionals. The method addresses two additional goals: (1) to formulate and test a rubric as a teaching and learning protocol for a multi-section course taught by various instructors; and (2) to assure that students' learning outcomes are consistently assessed against the rubric regardless of teacher or section. Steps in the process include formulating the rubric, collecting data, and sequentially analyzing the techniques used to validate the rubric and to insure precision in grading papers in multiple sections of a course.