in subsection (b) and the considerations described in subsection (c), for Executive agencies on the implementation of the goals established under section 2(b). (b) Requirements The guidance issued under subsection (a) shall provide, at a minimum, for the following: (1) The maintenance of a category hierarchy for common goods and services to be procured using category management, consistent with the considerations described in subsection (c). (2) The implementation of Governmentwide standards, policies, and guidelines for category management for Executive agencies. (3) The establishment of a single authoritative source for Governmentwide procurement data that enables category management analytics and reporting. (4) The maintenance and regular update of a set of criteria for, and list of, preferred Governmentwide contract vehicles. (5) A description of the specific data required to be submitted by each Executive agency to the Director relating to the implementation of the goals established under section 2(b). (6) Guidance on calculating and verifying annual contract reduction, spend under management, and savings. (7) The establishment of standards for Executive agencies to measure progress with respect to the implementation described in paragraph (2). (c) Considerations In developing guidance under subsection (a), the Director shall take into consideration the application of category management in a manner that— (1) maintains a strong industrial and manufacturing base in the United States