Requirement Assurance is an act of requirement verification which assures the stakeholder or customer that a product requirement has produced its \“as realized product\” and has been verified with conclusive evidence. Product requirement verification answers the question, \“did the product meet the stated specification, performance, or design documentation?.\” In order to ensure the system was built correctly, the practicing system engineer must verify each product requirement using verification methods of inspection, analysis, demonstration, or test. The products of these methods are the \“verification artifacts\” or \“closure artifacts\” which are the objective evidence needed to prove the product requirements meet the verification success criteria. Institutional direction is given to the System Engineer in NPR 7123.1A NASA Systems Engineering Processes and Requirements with regards to the requirement verification process. In response, the verification methodology offered in this report meets both the institutional process and requirement verification best practices.