This guide delves into often-overlooked federal funding sources that can be used to support local efforts to pursue rapid turnaround. Although focused on spending at the district and school levels, this guide is appropriate for those involved in school improvement at the state, district, or school level because policies and procedures at all those levels impact how funds are spent at the local level. The guide builds on "Four Domains for Rapid School Improvement: A Systems Framework," created by the Center on School Turnaround at WestEd to assist states, districts, and schools in leading and managing rapid school improvement efforts. The framework identifies four areas of focus that research and experience suggest are central to rapid and significant improvement. It also includes examples of practices, in each of these four areas, that can be put into action at the state, district, and school levels. This guide is organized into three sections. Section I highlights three ways ESSA facilitates spending on school improvement initiatives. Section II provides an overview of spending rules that apply to all federal grants, and summarizes the Title I Part A, Title II Part A, and IDEA Part B programs. Finally, Section III gives examples of how districts and schools can use Title I Part A, Title II Part A, and IDEA Part B funds to support the four domains for rapid school improvement. [The foreword for "Support for Rapid School Improvement: How Federal Dollars Can Be Leveraged for Systemic Improvement" was written by Carlas McCauley. For "Four Domains for Rapid School Improvement: A Systems Framework," see ED584107.]