A growing number of postsecondary institutions and systems have begun offering or scaling stackable credential programs. These structured education and training pathways--in fields such as health care, information technology, and manufacturing and engineering technology--provide individuals with opportunities to earn certificates, postsecondary credentials that require less time to complete than an associate's degree, typically between several weeks and a year of coursework and training to complete. These initial certificates provide individuals with immediate job possibilities. Stackable credential programs may be especially helpful for individuals from historically underserved communities. These programs offer greater flexibility to simultaneously navigate education, employment, family, and other responsibilities. Using administrative data from Colorado and Ohio, this study examined differences in credential stacking and labor market returns from stacking for low-income individuals versus middle- and high income individuals (combined). This report describes this study's approach, its key findings, and the implications of those findings. This report also describes work done by RAND Education and Labor and the Center for the Study of Higher and Postsecondary Education at the University of Michigan--Ann Arbor and documented in "Stackable Credential Pipelines and Equity for Low-Income Individuals: Evidence from Colorado and Ohio. Research Report. RR-A2484-1" (ED627835).