The ZERO TO THREE Critical Competencies for Infant-Toddler Educators Training-of-Trainers (ToT) is a unique course that prepares and can lead to certification of state-approved early childhood trainers to deliver the Critical Competencies in-person course and micro-courses (i.e., the Critical Competencies Course). Participants will examine the curriculum and practice delivering sections, in addition to examine the three critical competency areas and its research.