President Carter changed the name of the documents in the decision-making process, although the mechanics of NSC review differed little from that of previous administrations. The Presidential Review Memorandum (PRM) replaced the National Security Study Memorandum (NSSM), and the Presidential Directive (PD) supplanted the National Security Decision Memorandum (NSDM). PRMs identified topics to be researched by the NSC, defined the problem to be analyzed, set a deadline for the completion of the study, and assigned responsibility for it to one of the two NSC committees. If the selected committee were the Policy Review Committee, a member was designated to serve as study chairman. The study chairman assigned an ad hoc working group to complete the study, which was ultimately reviewed by the responsible committee (either the PRC or SCC). When the committee was satisfied that the study had incorporated meaningful options and supporting arguments, the study's conclusions went to the President in a 2- or 3-page memorandum, which in turn formed the basis for a Presidential Directive.
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