Evidence of the short- and long- term benefits of Pre-K is so compelling that K-12 districts, state education departments, and even federal officials have considered offering universal Pre-K at no cost to children and families. In Chicago, a plan published in March 2019 aimed to provide free Pre-K for all Chicago four-year-olds, regardless of income, by the fall of 2021. But while support for and enrollment rates in Pre-K have increased, attendance rates among students enrolled in Pre-K are lower than attendance rates in other elementary grades. Why are Pre-K students absent? While illness is a leading cause, logistical issues also pose challenges to families. Interviews with families suggest logistical challenges are greater for families in half-day programs. It can be difficult to pick students up in the middle of the day when parents are working. In addition, when a student is enrolled in a half-day program, families may be less inclined or able to spend limited resources and energy solving childcare issues, work schedule conflicts, transportation problems, a sick sibling, or other family commitments for a few hours of instruction. The researchers studied two initiatives that increased the availability of full-day Pre-K in Chicago Public Schools (CPS) to examine changes in attendance rates that occurred when students enrolled in full-day, rather than half-day, Pre-K programs: (1) CPS-Wide Full-Day Pre-K Expansion; and (2) The North Lawndale Cluster Initiative. The key finding from the report concludes when programs offered more full-day options, attendance rates increased, particularly for Black students. This suggests that full-day Pre-K better meets the needs of families' daily lives in ways that enable higher attendance, relative to half-day programs.