Critical: SSNs, payment data, PHI, financial systems, admin access to core systems
Examples: Payroll systems, banking platforms, ERP systems with full access
High: Customer PII, employee data, important business functions
Examples: CRM with customer data, email platforms, document storage
Medium: Limited business data, moderate operational impact
Examples: Project management tools, analytics platforms
Low: Public information, minimal business impact
Examples: Website monitoring, general research tools