6.78. The operator’s management system should comply with national standards on management systems and internationally recognized codes, regulations and standards should be used whenever possible [25?27]. An appropriate management system that integrates safety, health, environmental, security, quality and economic elements contributes to confidence that the relevant requirements and criteria for site characterization, design, construction, operation, closure and post-closure safety are met. The relevant activities, systems and components should be identified on the basis of the results of systematic safety assessments and application of the management system requirements should be graded in accordance with their importance to safety.