The analysis of data for instructional decision making is a hallmark of the 21st century. Teachers and administrators alike need a process that links instant, consistent, and relevant data to instant, consistent, and relevant results. Data! Dialogue! Decisions! describes a simple process–selecting a piece of data, dialoging about the data, and making SMART goal decisions about how to increase student performance–that includes the critical elements for powerful school improvement: meaningful teams, managed data, and measurable goals. Using a collegial process, administrators and teachers choose their own school of class achievement data to analyze and interpret as they target ‘breakthrough’ instructional decisions that yield rapid and quantifiable results. Results have been staggeringly successful.