Although most foundations are established in perpetuity, the limited life option is attracting more attention. This monograph helps fill a gap in the literature by examining the motivations, strategies, and experiences associated with the decision to "sunset" and comparing the attitudes and practices of perpetual and limited life foundations. The report draws on survey data on over 800 private foundations with varied longevity plans, and in-depth interviews with 31 foundations that have considered or plan termination.