This is the fourth in a series of monographs from the CGS Ph.D. Completion Project. This monograph reports on policies and practices at participating institutions that aim to improve Ph.D. completion rates and reduce attrition in doctoral programs. These policies and practices are categorized into six broad institutional and programmatic categories: selection and admissions; mentoring and advising; financial support; research mode of the field; curricular and administrative processes and procedures; and program environment.