This issue of "NECTAC Notes" concludes that states have exhibited a strong interest in using the option of a developmental delay eligibility category for young children served by IDEA. Future changes in state eligibility policies may reflect several provisions related to eligibility policies and practices that are contained in the regulations. These provisions require that: a variety of assessment tools and strategies, including information from parents, be used to gather relevant functional and developmental information to assist in determining eligibility (see 34 C.F.R. Section 300.532-Evaluation procedures); a team of qualified professionals and the parent(s) of the child be involved in the eligibility decision (see 34 C.F.R. Section 300.534-Determination of eligibility); and the IEP team for each eligible child include the parents of the child (see 34 C.F.R. Section 300.344-IEP team). Topics covered in this issue include: (1) Findings; (2) Disability Terminology Used for Young Children; (3) Age Ranges Used by States for Developmental Delay; (4) Relationship between Developmental Delay and Other Part B Categories; and (5) Eligibility Criteria for Developmental Delay. Also included are detailed tables on: Part B Disability Categories Under IDEA; IDEA Regulations Related to Developmental Delay for Children Ages 3 through 9 Years; State Eligibility Classifications and Criteria for Young Children Under Part B of IDEA; and Early Childhood Special Education Eligibility Criteria in the States, and District of Columbia, as of January 2004.