Before assigning sensitivity levels to information, it is most important to define the information classification policy. The information classification policy is a document that establishes the criteria, categories, roles, responsibilities, and procedures for classifying information according to its sensitivity, value, and criticality.
The information classification policy provides the basis, guidance, and consistency for assigning sensitivity levels to information, and ensures that the information is protected and handled appropriately. The other options are not as important as defining the information classification policy, as they are related to the specific steps, activities, or outputs of the information classification process, not the overall structure and quality of the information classification process. References = Risk and Information Systems Control Study Manual, Chapter 4: Risk and Control Monitoring and Reporting, Section 4.4: Key Control Indicators, page 211.