The National Child Count of Children and Youth who are Deaf-Blind is the first and longest running registry and knowledge base of children who are deaf-blind in the world. Begun in 1986 on behalf of the U.S. Department of Education (Baldwin, 1993), it represents a thirty plus year collaborative effort between the National Consortium on Deaf-Blindness (NCDB), its predecessors, and each state deaf-blind project throughout the country, as well as those projects funded in the Pacific Trust territories--the Virgin Islands and Puerto Rico. Initially requested by the Department of Education as an examination of the discrepancy between the state/multi-state child counts and OSEP's annual December 1 counts (Baldwin, 1993), the child count has continued based on the work scope of the deaf-blind program national center technical assistance and dissemination centers and state/multi-state projects which have been federally funded in ensuing years. It has been collaboratively designed, implemented and revised to serve as the common vehicle to meet federal grant requirements for both the state/multi-state and national technical assistance projects, as well as serving as a common data collection and reporting mechanism for use across the country. With the publication of the 2007 child count NCDB has implemented a comprehensive revision of its child count reporting elements that addresses four specific issues: (1) Easing the data collection burden of the projects; (2) Increasing the efficiency of data collection activities; (3) Increasing the accuracy of the data collected and reported; and (4) Increasing cost efficiency. Activities initiated to ameliorate these identified issues included: (1) Definitional changes to increase consistency across states; (2) Realignment of data elements with IDEA, section 618 data reporting requirements; and (3) Changes in documentation procedures consistent with IDEA classification and reclassification regulatory changes. [For the 2006 Deaf-Blind Child Count, see ED545207.]