This article presents a progress report on urban school districts' efforts to execute the mandates of the No Child Left Behind Act, a law they greeted with both hope and fear due to the sanctions it authorized against failing systems. To investigate their progress, the Council of the Great City Schools conducted a survey of its 60 member urban school districts and requested data on two of the measure's accountability provisions: choice and supplemental services. Results from the 46 districts that responded as of November 2003 suggest that urban districts are implementing the requirements in these two areas, but are confronting a number of challenges as they do so. In this article, the author details their actions and the difficulties they face implementing three provisions of NCLB: (1) public school choice; (2) school capacity and choice; and (3) supplemental services to show that the law is experiencing growing pains, but largely viewed positively by urban school administrators. (Contains 3 figures.)