Which of the following is NOT a step in derivative classification?

The step that is not part of derivative classification is the review of historical documents. Derivative classification involves the process of taking existing classified information and applying it to new documents, thereby determining the appropriate classification levels, marking recommendations, and preparing those new documents accordingly.

In derivative classification, the focus is on how new information is derived from already classified sources, and this does not typically require reviewing historical documents unless it is to ensure that the derived classifications comply with existing guidelines. The other steps—determining classification levels, making recommendations for marking, and preparing the new document—are integral parts of the process to ensure that information is properly protected based on existing classification systems.