A study that undertakes four tasks: (1) piloting and validating four linked state child care Quality Rating Systems (QRS); (2) identifying what training providers at different levels in the QRS select; (3) measuring the effects of training on child care quality; and (4) assessing provider attitudes about professional development, and parent attitudes about quality ratings. Methods include interviews and observations involving four hundred child care centers and family child care homes, 600 classrooms, 2,200 child care providers, and 200 child care center directors in 8 randomly selected communities (one rural and one urban community from each state), in addition to interviews and focus groups with subsidy-receiving and non-subsidy-receiving parents. The study informs child care policy and program choices about investments in child care quality and provider training and professional development, and outcomes that relate to alternative child care subsidy policies.