This "Guide" is an update to the State Guide to Universally Designed Assessments produced by the National Center on Educational Outcomes (NCEO) in 2006 (Johnstone et al.). It provides a brief overview of what a universally designed assessment is, followed by a set of steps for states to consider when designing and developing, or revising, their summative assessments. The focus of this "Guide" is states' summative assessments--general content assessments of reading/language arts, mathematics, science, and other content; alternate assessments based on alternate academic achievement standards (AA-AAAS); English language proficiency (ELP) assessments; and alternate-ELP assessments. The purpose of this "Guide" is to provide states with strategies for designing tests from the very beginning. The objective is to create tests that present an accurate measure of the knowledge and skills of diverse student populations.