Which of the following DITSCAP phases validates that the preceding work has produced an IS that operates in a specified computing environment? Response:

Phase 4 (Post-Accreditation) involves continuous monitoring and re-evaluation after the system is accredited, not the initial validation of preceding work.

DITSCAP (Department of Defense Information Technology Security Certification and Accreditation Process) Phase 3, known as 'Validation,' is specifically where the security controls are validated and tested in the operational environment to ensure the system operates securely as intended. This phase confirms that the previous design and implementation work meet the specified security requirements.

Phase 2 (Certification) focuses on security requirements, design, and implementation, preparing for testing but not performing the final validation in the operational environment.

Phase 1 (Definition) establishes the scope, security requirements, and accreditation boundaries for the system.