Making good decisions about sustainability requires explicit consideration about what criteria to use. Three grand traditions dominate most policy discussions: utilitarianism, deliberative ethics and anarchism/libertarianism. The chapter proposes seven criteria for good decisions. Three are criteria for the outcomes. A good decision should enhance the well-being of humans and other species while reducing stress on the environment; be efficient in allocating resources; and enhance individual freedoms. Four are criteria about process: take account of uncertainty in both facts and values, as well as value conflicts; promote fairness in both the decision process and its outcomes; rely on human cognitive strengths and compensate for weaknesses; and allow for social learning.