Identifying the competencies (knowledge, skills, abilities, and other characteristics) essential to a given profession may help to provide a common language and lens for assessing job performance and provide a clear structure for professional growth and development. The Infant and Toddler Teacher and Caregiver Competencies (ITTCC) project will examine existing efforts -- across states, institutes of higher education, professional organizations, and programs-- related to competencies for teachers and caregivers serving infants and toddlers. The ITTCC project will explore approaches to the implementation and assessment of competencies, building a conceptual foundation for measurement, research, and evaluation.