The first chapter of this TYNDP provides a detailed overview of gas infrastructure projects as submitted by their promoters. In addition to the FID criterion used in pre- vious editions, projects are now further differentiated according to their PCI status resulting from the first selection done by the European Commission in 2013. This section also covers the identification of barriers to investment factoring the promot- ers’ experience. A description of each project can be found in annexes. The Supply and Demand chapters contain a detailed description of the twenty year range of scenarios used to support the Supply Adequacy Outlook. These scenarios are fundamental for the assessment of gas infrastructure. The European gas demand projections are based on TSO data and include an increased focus on the role of gas for power generation as a result of further collaboration with ENTSO-E. Supply scenarios are derived from publicly available data from governmental and other recognised sources. ENTSOG’s assumptions regarding interpretation of the data are included to ensure transparency. The Assessment Results chapter represents the outcome of the TYNDP-step for the Energy System-Wide Cost-Benefit Analysis. This is also an initial input for the process related to the second selection of PCIs. It also provides feedback on the impact of aggregated first PCI list. The relevant part of the methodology can be found in Annex F. For each scenario combination results identify: \\ system resilience under diverse infrastructure and supply perspectives supporting the identification of potential investment \\ physical and price dependence of each zone on gas import sources \\ diversification of supply and diversification of routes \\ price convergence across Europe The TYNDP Annexes provide access to the input data for the ENTSOG network model, detailed information on all TYNDP infrastructure projects and additional historical information regarding the covered zones of the European gas system. This TYNDP shows the ambition of the European TSOs to tackle the joint challeng- es of increasing stakeholder expectations and new regulatory requirements. The close working relationship of TSOs within ENTSOG has been decisive in that respect. ENTSOG would also like to highlight that all necessary improvements could not have materialized without stakeholder commitment. ENTSOG welcomes feedback on the TYNDP report and development process. This will constitute the basis for the con- tinuous improvement of this deliverable.