Applicable to Defense Business Systems (DBS). A stand-alone document to support the Materiel Development Decision (MDD), and later key decision events and milestones. The Problem Statement documents DBS requirements and is approved by the Investment Review Board (IRB) chair. It documents business and supporting analysis and evolves over time as those needs are refined. The Joint Staff (JS) (J-8) will review the initial Problem Statement to determine if there is JS interest.