With the ready availability of educational data, the need for school administrators and other educators to understand and manage data has grown considerably. To meet that need, this text offers a novel theoretical approach to school leadership and decision-making—Ecological Thinking—and a set of practical tools for data analysis and model-based decision-making using spreadsheet software and system dynamics models. Included are numerous data sets and specific examples of the use of the popular software Microsoft® Excel; several system dynamics models created by the software ITHINK6.0; a wealth of hands-on exercises; and, an introduction to the development of dynamic simulations.