The overarching goal of this dissertation was to promote the health of young children in child care through a nutrition and physical activity environmental intervention. This dissertation consisted of three distinct projects including pilot testing of a recently developed nutrition and physical activity environmental intervention; comparison of two methods to train community health professionals to deliver the intervention; and assessment of the reliability (test-retest and inter-rater) and validity of the self-assessment instrument which was a key component of the intervention. (author abstract)