At least half of states administer or are developing kindergarten entry assessments. In fall 2017 the Illinois State Board of Education began requiring teachers to report data on every child’s skills at kindergarten entry using the Kindergarten Individual Development Survey. State and local stakeholders have asked for more information on the reliability and validity of the survey and on the gaps in children’s skills at school entry. This study analyzed the psychometric properties of the 14 required items on the survey after its first statewide administration. It examined average skills and the variation in skill levels at kindergarten entry, as well as their differences across child subgroups and school poverty levels. And it interviewed teachers and principals about barriers in administering the survey and suggestions for improvement. (author abstract)