This Working Paper compiles a set of recent comparable OECD data on revenues, inputs, and public sector processes and proposes a way forward in data collection. It is the first of three annual Working Papers as the Public Governance and Territorial Development (GOV) Directorate of the OECD builds up to the first publication of a major biennial publication, “Government at a Glance”, in late 2009. It is accompanied by a volume entitled “Measuring Government Activities” (OECD, forthcoming) that sets out the proposed approach and that poses technical alternatives for expert review and comment. The first part of this volume provides a comprehensive exposition of the proposed data classification and analysis.