The purpose of this paper is to determine what the evidence and conventional wisdom say about scaling-up home visiting as one of the best ways to support parents and promote early childhood development. To answer this question, we examined the available research evidence, interviewed leaders from six of the national home visiting models, and interviewed researchers who have studied home visiting. The area of interest for guiding future research, practice, and policy is whether home visiting can be delivered at broad scale and with the quality necessary to attain demonstrable, positive outcomes for young children and their parents. (author abstract)