Public Policy Associates, Inc. (PPA), the Michigan Department of Education (MDE), and the Michigan Department of Health and Human Services (MDHHS) are partnering to carry out a study of the effects of child care assistance program policy changes. This phase of the study focused on the effects of policy changes on child care subsidy application approvals and utilization. The impact of a policy change was estimated based on differences in program outcomes before and after the policy was adopted, using an interrupted time series (ITS) analysis of data provided by the State and the U.S. Census. These findings are supplemented by qualitative data gathered through child care provider interviews, a survey of MDHHS caseworkers (or specialists), and a self-assessment of policy coordination completed by Child Care Policy Research Partnership (CCPRP) agency staff. (author abstract)