Introduction.-Accessible Tests, Inclusive Assessment Systems, & Needed Innovations.-I. Federal Policies & Legal Considerations.-Federal Policies that Support Inclusive Assessments.-IEP Team Decision Making for More Inclusive Assessments.-Legal Issues in Testing.-II. Classroom Connections.-Opportunity to Learn What is Tested.-Classroom Learning and Students with Persistent Academic Difficulties.-Instructional Accommodations and Modifications that Support Learning.-Test-wiseness and Test Preparation.-III.Test Design Principles and Innovative Practices for More Accessible Tests.-Validity Evidence for Accommodated and Modified Tests.-Item Writing Research.-Universal Design and Cognitive Load Theories Influence on Item and Test Design.-Testing Accommodations and Item Modifications: Research to Guide Practice.-Students Input: Cognitive Labs and Surveys.-Computerized Tests Sensitive to Individual Needs.-Defining Proficient Performances and Setting Standards.-Conclusions: Accessibility Challenges, Innovative Answers.-Implementing Modified Achievement Tests: Cost / Benefits.-Accessible Tests of Student Achievement: Why now and How