The potential to foster successfully starts with developing and supporting competency in 12 domains: (1) providing a safe and secure environment; (2) providing a nurturing environment; (3) promoting educational attainment and success; (4) meeting physical and mental healthcare needs; (5) promoting social and emotional development; (6) supporting diversity and children's cultural needs; (7) supporting permanency planning; (8) managing ambiguity and loss for the foster child and family; (9) growing as a foster parent; (10) managing the demands of fostering on personal and familial well-being; (11) supporting relationships between children and their families; and (12) working as a team member. This article describes each domain and reviews relevant research to help guide the assessment of practicing and future foster parents.