This Mentor-Connect Building Block introduces the Motivating Rationale. The Motivating Rationale conveys the purpose of your ATE proposal. This two-page guide covers the who, what, and why, of the Motivating Rationale, as well as a Motivating Rationale storyboard and helpful hints for completing this important portion of your proposal. By using this guide you should feel confident in crafting an effective data-driven and student-centered Motivating Rationale for your ATE proposal.