As communities across California commit to developing systems of high school pathways that will engage students in school and prepare them to succeed in postsecondary opportunities and contribute to a vital regional economy, many are realizing the importance of providing "broad-based support" for this work. Students need a choice of pathways focused on various industry themes--which requires districts to offer systems of pathways. This is challenging work and takes many years of dedicated attention by a host of partners. Whether planned and implemented quickly or gradually, the time it takes to develop a system of pathways sometimes extends beyond the tenure of a superintendent or the election cycle of school board members. Thus, it is critical that key stakeholders form a Broad-Based Coalition to maintain the vision, dedicate resources to realize that vision, and share the accountability for results. After all, building a system of pathways relies on the expertise, influence, staff support, and contributions of a full range of partners. This "Guide" is intended to help communities conceptualize and form a Broad-Based Coalition that will mature over time and ultimately assume primary responsibility for sustaining a system of high quality pathways. Of course, each community will approach this work differently and adapt features of the Broad-Based Coalition to meet its unique values, interests, and needs. (Contains 1 footnote.)