This resource addresses the critical need to improve educational experiences and outcomes for students with disabilities by fostering inclusive, coherent, and effective local assessment systems. Current assessment practices often fail to meaningfully engage all learners, particularly those with disabilities. This guide equips education leaders with actionable strategies for proactively designing and implementing assessment systems that embrace learner variability, promote inclusion, and support the growth of all students. By emphasizing principles of coherence and inclusion, they can transform assessment systems into powerful tools for driving equitable opportunities and outcomes.