This policy memo examines reasons why a small share of assisted housing residents may opt to change from project-based vouchers to portable, tenant-based vouchers.We found that in addition to structural reasons related to the local housing market and local programmatic polices, households move for several reasons, including finding a better unit; moving closer to family, services, or schools; or, for some programs that required services or additional tenancy rules, transitioning toward more independent housing. In addition, housing authority staff also reported that some households moved because of poor quality housing and unsafe neighborhoods.