How do districts create principal pipelines that last in the face of change and uncertainty? By thinking long-term from the start of planning. This report from Vanderbilt Peabody College and Policy Studies Associates offers an "Implementing for Sustainability" framework. It also gives guidance for districts who want to incorporate sustainability as an early and ongoing part of developing principal pipelines. The framework builds on decades of prior research and was further developed through findings from the Principal Pipeline Learning Community (PPLC). The PPLC was a network of 84 medium- and large-sized districts that Wallace helped bring together to plan, develop, and learn from the research on principal pipelines and one another. Wallace did not fund the districts. Those who participated sought to create effective and enduring systems for developing and supporting school leaders. The framework in this report identifies four dimensions, or pillars, districts can work within when planning for long-lasting pipelines: (1) Ensuring strategic alignment through vision and policy, such as making pipelines an explicit part of strategic plans and initiatives; (2) Communicating clarity in Intent through social and organizational awareness, such as district leadership articulating a commitment to pipelines; (3) Aligning institutional elements and supports through people and resources, such as dedicated funding streams and hiring additional personnel to support pipelines as needed; and (4) Maintaining priority (of pipelines) through culture, stakeholder engagement, and evaluation, such as communicating rationale of pipelines to board members and local leaders and setting clear goals and assessment movement toward those goals. Through interviews with technical assistance providers, the research team identified four districts who had taken proactive efforts to make sustainable evidence-based changes to their principal pipelines. They developed case studies to demonstrate how these districts were successful. The districts are: Newark Board of Education, Greenville County Schools, The School District of Philadelphia, and Cumberland County Schools. The research team found that while every school district approached how it built its pipeline differently, there are common components across systems that found lasting success. These elements can help facilitate the pillars that make up the Implementing for Sustainability framework described above: (1) A vocal champion who communicates the vision for leadership pipelines; (2) A pipeline leader who acts as the "hub"; (3) Central office coordination to foster collaboration around the pipeline; and (4) Alignment of pipeline evaluation metrics to broader district strategic goals and planning.