what is a security classification guide

A security classification guide (SCG) is a formal record of original classification decisions made by an Original Classification Authority (OCA) regarding what specific elements of program-specific information should or should not be classified. It serves as detailed guidance for derivative classifiers to apply accurate classification markings, ensuring consistent application of classification levels and protection measures across documents related to a system, plan, program, or project. The SCG helps standardize the classification process, improve derivative classification decisions, and refer to release and dissemination controls, without making classification decisions for the user or changing the unclassified status of information. Security classification guides typically include the subject matter, date of issuance or review, identification of the OCA, agency point of contact, specific information elements to be protected, classification levels, reasons for classification, declassification instructions, and handling caveats. They are essential for communicating classification decisions to maintain uniformity and protect sensitive information properly.