a shared definition of the stakeholders' objectives, and their expression in basic asset performance levels. Key research topics are the inventory and quantification of the needs, risks in view of the strategic policy goals of the stakeholders along the TEN-T corridors and their relation to asset performance levels in terms of reliability, availability, maintainability, safety and security, health, environment, etc. This forms the basis for cost-benefit assessments across the chain back-to-back) in which the focus is on harvesting synergies between investment in construction , maintenance enhancement and renewal