This module describes the two interviews that were conducted with a sample of Head Start parents and family service staff (FSS) as part of the Family Engagement Plus study. It identifies the purposes of each interview and its contents. The supplemental questions pertaining to families' engagement with the Head Start program that were included on the spring Core parent and teacher surveys are also described. Again, individual survey and interview items can be found in the appendices to the user's manual. The material in this module is directed to all researchers who want to explore these data.