Abstract: This paper presents the experiences and the lessons learned by 22 partner countries in Africa, Latin America and Asia related to the application of the Methodology for the Assessment of National Procurement Systems of the OECD/DAC Joint Venture on Procurement. The Methodology was developed and approved for field testing in 2006 as an input for implementing the Paris Declaration agenda and to assist in strengthening country procurement systems. It is the result of the joint efforts of multilateral and bilateral development partners and of partner countries from around the world. These experiences and lessons represent some early results achieved by a group of volunteer partner governments working in collaboration with national stakeholders from civil society, the private sector, the media, elected members of parliament and with their international development partners. The present document is limited to sharing experiences in using the Methodology. Country examples from the pilot exercises and from other applications are used as case studies. A mapping of various country experiences in using the Methodology is provided in Annex A. The present document seeks to provide useful background information drawn from various available sources.