5 CFR § 330.601 - Purpose.
(a) An agency's Career Transition Assistance Plan (CTAP) provides intra-agency selection priority for the agency's eligible surplus and displaced employees. This subpart sets forth minimum requirements for agency plans and establishes requirements for CTAP selection priority.
(c) With prior OPM approval, an agency may operate an alternate placement program that satisfies the basic requirements of this subpart as an exception to CTAP selection priority under this subpart. This provision allows agencies to adopt different placement strategies that are effective for their programs while satisfying employee entitlements to selection priority.