Prodded by an outpouring of philanthropic and federal largess, school districts and even some states are downsizing public high schools to combat high dropout rates and low levels of student achievement, especially in big- city school systems. For longtime proponents of small schools, the upswell in support for their ideas is making for heady times. Despite the concept's unprecedented popularity, however, evidence is mounting that "scaling up" scaled-down schooling is extraordinarily complex. A sometimes confusing array of approaches is unfolding under the banner of small high schools, contributing to concerns that much of the flurry of activity may be destined for disappointing results. This article presents issues on whether and how to scale up scaled-down schooling.