This June, on the cusp of California’s full expansion of TK, the Public Policy Institute of California published an in-depth report analyzing the program, enrollment patterns, and related observations. Laura Hill, a policy director and senior fellow at PPIC and lead author of the report, spoke with Education Week about her findings, which provide insights for administrators and policymakers considering launching or expanding a TK program in their own state or district. Hill says, “If you’re going to move TK into K-12, then I think as much attention as possible needs to be given to making sure that there are early childhood experts ready to help the system navigate the change: Making sure the teachers are prepared and the curriculum is ready, preparing the physical space, and helping districts’ senior leadership understand that TK children, 4-year-olds, are not just little kindergarteners—they’re really, really different.”