Early childhood home visiting has policy and programmatic support for the past fifty years as a strategy to promote child health and well-being. During this time, the traditional research paradigm has been to conduct randomized trials to estimate the average effects of full home visiting models. This research has produced enough positive findings to form an evidence base that supports investment in the scale up of home visiting and for designating specific models in which to invest. Such an evidence-based approach has been used for many initiatives, including the U.S. federally funded Maternal Infant and Early Childhood Home Visiting program (MIECHV) and the Family First Prevention Services Act (FFPSA) initiative. But in all fields, research methods must evolve to meet needs for new knowledge.
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