NASA Procedures and Guidelines
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NPR 1400.1C Eff. Date: February 13, 2002 Cancellation Date: February 18, 2007	NASA Directives System Procedural Requirements w/Changes 1-4, 12/5/03
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CHAPTER 4. Directives Numbering

4.1 Numbering Scheme

Directives numbers are comprised of six elements that create a unique identifier-- one or two letters indicating NASA Center, two letters indicating the directive type, four numbers indicating the subject classification, a separator (period), the directive number (serial), and a letter indicating the revision level:

4.2 Subject Classification Numbers

The numbers used to classify NASA Directives are the same subject classification numbers in both the Agency Retention Schedules, the body of NPR 1441.1, "Records Retention Schedules" and the Agency Filing Scheme, the Appendix A of NPR 1441.1. (NOTE: Anomalies in NPR 1441.1 will be corrected and coordinated with the National Archives and Records Service.)

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