Since the publication of "Redesigning America's Community Colleges" (Thomas Bailey, Shanna Smith Jaggars, and Davis Jenkins) in 2015, guided pathways reform has become a national movement in community colleges. As of spring 2018, more than 250 community colleges have committed to undertaking large-scale guided pathways reforms as part of national, state, or regional efforts, and many other colleges are doing so on their own. Guided pathways colleges are redesigning their policies, programs, and services to support student success in four major practice areas: (1) mapping pathways to student end goals; (2) helping students choose and enter a program pathway; (3) keeping students on path; and (4) ensuring that students are learning. Part 1 of this practitioner packet provides an overview of the changes in practice involved in the four areas of the guided pathways model. It also presents examples from colleges and data on improvements they have achieved in leading indicators of longer term success. [For "Part 2: Case Studies," see ED582821. For "Part 3: Timeline and Tips for Implementing Pathways Reforms," see ED582823.]