In his recent State of the Union Address, President Obama proposed to "make high-quality preschool available to every child in America." He referred to research that has demonstrated long term positive effects of attending high-quality preschool programs. President Obama's support has excited the early childhood community. Who could be opposed to expanding high-quality preschool opportunities? Yet this begs the question: What does "high-quality" mean in practice? "High-quality" preschools are often defined by educators and economists alike as ones in which teachers are adequately paid, facilities are adequate, and the ratio of staff to children is low. These are indeed important elements of quality and they are serious problems, as preschool educators are often very poorly paid, poorly educated themselves, and lack decent facilities. The low salaries received by preschool teachers leads to a high turnover rate, which also reduces quality. So ensuring universal access to high-quality preschools when many current preschoolers are already struggling with quality and funding issues will be a heavy lift. Leaving aside money issues, however, there is an important question about how preschool programs should be structured. There is lots of research showing the benefits of high-quality preschool in comparison to no preschool (as in the famous Perry Preschool and Abecedarianprograms). However, there is far less research showing different benefits of different preschool approaches.