Conclusions of the Twenty Third Session of the High Level Committee on Management’s Procurement Network (HLCM PN), UN City, Copenhagen, 14-16 March 2018. The Session included updates from the Working Groups on Harmonisation, Professional Development, Strategic Vendor Management and Sustainable Procurement as well as a status report on the UN Global Marketplace (UNGM) and the project on Collaborative Procurement of High Value Commodities – ICT Hardware. The following ‘Show and Tell’ interventions were also part of the agenda: (i) An introduction to the Danish State and Municipality Purchasing Agency, (ii) Implementation of GS1 Standard to Improve Supply Chain Management and Data Visibility at UNFPA, (iii) Public Procurement Procedures for Innovative Solutions, (iv) Financing and Domestic Resource Mobilization Strategy at UNICEF, (v) Update on UNOPS eSourcing and other eProcurement initiatives, (vi) An Introduction to the World Maritime University, (vii) Opportunity Costs in Public Procurement.