The Early Childhood Personnel Center (ECPC) was funded by the Office of Special Education Programs at the U.S. Department of Education to provide technical assistance to State Systems of Early Childhood Intervention and Institutions of Higher Education on issues related to personnel development. One initiative of the ECPC has been to collaborate with professional organizations to identify core cross-disciplinary competencies for all personnel serving infants and young children aged birth through 5 years with disabilities and their families. Seven national organizations representing disciplines providing services in early childhood intervention have been participating in this initiative: the American Occupational Therapy Association; the American Physical Therapy Association; the American Speech-Language-Hearing Association; the Council for Exceptional Children and the Division for Early Childhood; the National Association for the Education of Young Children; and Zero to Three. Alignments of personnel standards, practice guidelines, and competencies yielded 4 areas of competence that are common across service providers serving infants and young children with disabilities and their families. These are: Collaboration and Coordination; Family-Centered Practice; Evidence-Based Practice; and Professionalism.