The 35th Annual Report to Congress on the Implementation of the "Individuals with Disabilities Education Act," 2013 describes the nation's progress in (1) providing a free appropriate public education (FAPE) for all children with disabilities, (2) ensuring that the rights of children with disabilities and their parents are protected, (3) assisting states and localities in providing for the education of all children with disabilities, and (4) assessing the effectiveness of efforts to educate children with disabilities. The report focuses on the children and students with disabilities being served under IDEA, Part C or B, nationally and at the state level. In particular, Part C of IDEA provides funds to states to assist them in developing and implementing statewide, comprehensive, coordinated, multidisciplinary interagency systems to make early intervention services available to all children from birth through age 2 with disabilities and their families, whereas Part B of IDEA provides funds to states to assist them in providing FAPE to children ages 3 through 21 with disabilities who are in need of special education and related services. Throughout this report, infants and toddlers served under IDEA, Part C, children served under IDEA, Part B, and students served under IDEA, Part B, refer to individuals with disabilities who receive services under IDEA, Part C or Part B. "Special education services," which is referenced throughout this report, is a term that is synonymous with services provided under IDEA, Part B. Similarly, "early intervention services" is a term used synonymously with services provided under IDEA, Part C. This "35th Annual Report to Congress," 2013 follows the "34th Annual Report to Congress," 2012 in sequence and format, and it continues to focus on IDEA results and accountability. Similar to the "34th Annual Report," 2012, the 35th Annual Report, 2013 contains six major sections that address the five annual report requirements contained in section 664(d) of IDEA. The sections are: (1) a summary and analysis of IDEA section 618 data at the national level; (2) a summary and analysis of IDEA section 618 data at the state level; (3) a summary and analysis of the U.S. Department of Education's (Department's) findings and determinations regarding the extent to which states are meeting the requirements of IDEA, Parts B and C; (4) a summary of special education research conducted under Part E of the "Education Sciences Reform Act of 2002"; (5) a summary of national special education studies and evaluations conducted under sections 664(a) and (c) of IDEA; and (6) a summary of the extent and progress of the assessment of national activities, which focus on determining the effectiveness of IDEA and improving its implementation. The content of this report differs from that of the 34th Annual Report, 2012 in that it does not include an exhibit in Section II that presents data about exits from Part B for states that used and states that did not use exit exams for students served under IDEA, Part B. The source of information that had been used to classify the states regarding the use of exit exams did not include information about the time period addressed in this report, and no alternative source was identified. Appendices include: (1) Infants, Toddlers, Children, and Students Served Under "IDEA," by Age Group and State; (2) Developmental Delay Data for Children Ages 3 Through 5 and Students Ages 6 Through 9 Served Under "IDEA," Part B; and (3) Differences in State Reporting of "IDEA," Part B, Disabilities.