The purpose of this guide is to help readers clarify their roles in the college access and success system and to identify how they might use data to create change for students. This guide shows how data can strengthen current programs and support broader changes that ease the path to college for students. This guide illuminates how a long-term data-collection strategy can help organizations both maximize the impact of their own programming and strengthen the connections of their work to other programs, thus improving student experiences and outcomes. Section I presents an overview of the college access and success system, includes a brief description of the various stakeholders and their roles and concludes with an examination of data's role in building the system. Section II focuses on how stakeholders can use data to develop partnerships in increasing college access. Finally, Section III examines how data can improve individual programs. The guide concludes with a brief summary and a checklist on data collection and use. Appended are: (1) About the OMG Center for Collaborative Learning; and (2) Selected electronic resources on data solutions and usage. (Contains 6 figures and 6 footnotes.)