The Maternal, Infant, and Early Childhood Home Visiting Program, authorized by the Patient Protection and Affordable Care Act of 2010, represents a major expansion for evidence-based home visiting services. Over the next five years, the program will provide $1.5 billion to states to invest in selected home-based services to promote early childhood health and development and, ultimately, improve outcomes and opportunities for children and families. To maximize the return on this major public investment, the legislation places particular emphasis on building states' capacity to assess the fidelity and quality of the replication and expansion of evidence-based home visiting models. Fidelity includes adhering to a model's staff training, certification, and supervision requirements; delivering family-level services at the specified intensity (dosage); and covering the prescribed content. Quality refers to how effectively the content is conveyed to families; for example, whether the home visitor engages parents during the visit and whether this engagement is evidence of a positive, trusting relationship between the home visitor and the parents. This brief presents a framework for monitoring fidelity to home visiting program models developed as part of the Supporting Evidence-Based Home Visiting to Prevent Child Maltreatment (EBHV) initiative's cross-site evaluation. (author abstract)