This 55-page research-based guide from the Wallace Foundation and the Policy Studies Associates is intended to help school districts evaluate their principal pipelines and to plan for improvement. District leaders can rate their status on each indicator and consider how they make use of seven interrelated pipeline domains: (1) leader standards, (2) high-quality preservice principal preparation, (3) selective hiring and placement of principals, (4) on-the-job evaluation and support, (5) principal supervisors, (6) leader tracking systems, and (7) systems and capacity to support and sustain a principal pipeline. For each domain, this guide identifies indicators of implementation and suggests discussion questions and local evidence for districts to consider as they reflect on their ratings.