What does the classification concept of "classification by compilation" refer to?

• A. Classifying information based on its source
• B. Classifying documents that contain original classification
• C. Aggregating unclassified information that becomes classified together
• D. Using compiled data to challenge existing classifications

Answer: (C)

"Classification by compilation" refers to the process of taking unclassified information that, when aggregated, results in a new document or dataset that requires classification due to the sensitivity of the combined information. This concept acknowledges that while individual pieces of information may not be classified on their own, their compilation can reveal critical insights or sensitive data that could jeopardize national security or other interests if disclosed.

In practical terms, this means that even though the individual components of a collection may not have been marked with a classification designation, the very act of putting them together can cause a shift in their classification status due to the risk of revealing more than would be disclosed if the information were viewed in isolation. It emphasizes the importance of careful handling and consideration of how information is compiled, as it can change the overall classification requirements and necessitate protection under existing classification guidelines. This principle is essential in maintaining the integrity and security of sensitive information within the classification system.