This guide offers help for districts looking to create or improve a principal pipeline:  Principal Pipeline Self-Study Guide for Districts 

This guide helps school districts looking to invest in principal pipelines find the most promising federal funding to support their work: Strong Pipelines, Strong Principals: A Guide for Leveraging Federal Sources to Fund Principal Pipelines

This report describes numerous policy actions that states can consider taking to help school districts build effective principal pipelines: How Can State Policy Support Local School Districts as They Develop Principal Pipelines?