The Smarter Balanced Assessment Consortium (Smarter Balanced) strives to provide every student with a positive and productive assessment experience, generating results that are a fair and accurate estimate of each student's achievement. Further, Smarter Balanced is building on a framework of accessibility for all students, including English Learners (ELs), students with disabilities, and ELs with disabilities, but not limited to those groups. In the process of developing its next-generation assessments to measure students' knowledge and skills as they progress toward college and career readiness, Smarter Balanced recognized that the validity of assessment results depends on each and every student having appropriate universal tools, designated supports, and accommodations when needed based on the constructs being measured by the assessment. This document was developed for the Smarter Balanced members to guide the selection and administration of universal tools, designated supports, and accommodations. The "Smarter Balanced Guidelines" apply to all students. They emphasize an individualized approach to the implementation of assessment practices for those students who have diverse needs and participate in large-scale content assessments. This document focuses on universal tools, designated supports, and accommodations for the Smarter Balanced content assessments of English language arts (ELA)/literacy and mathematics (math). At the same time, it supports important instructional decisions about accessibility and accommodations for students who participate in the Smarter Balanced assessments. It recognizes the critical connection between accessibility and accommodations in instruction and accessibility and accommodations during assessment. [For the 2018 edition, see ED589700.]