For those who completed their doctoral training on or after 1/01/05, ABCN requires that at least 50% of postdoctoral training be in the provision of clinical neuropsychological services that are supervised by a clinical neuropsychologist. These services are to be provided for a substantial amount of time during the entirety of the postdoctoral training experience. Fellowship training should involve the provision of clinical neuropsychological services to individuals with a diversity of clinical diagnostic issues.