This document provides an overview of building a youth development system in a community. It discusses key concepts in positive youth development including focusing on competencies for adulthood and meeting developmental needs. A youth development system is defined as partnerships between organizations that plan and deliver services based on youth principles. It should include a menu of learning, work, skill development and leadership opportunities. Building a system requires convening stakeholders, creating a shared vision, assessing community resources and gaps, and developing a strategic plan with goals and roles defined. The document provides tips for system-building including leveraging partnerships and resources and starting initiatives on a small scale.