To date, the classification of resources and commodities has been used almost exclusively for valuable materials that can be economically extracted from the subsurface, e.g., hydrocarbons, metal ore, coal, etc. These industries have benefited from the establishment of classification systems with consistent terms and definitions that have gained international acceptance. As the CCS industry grows, there is increasing need for an accepted classification system that describes the available CO2 storage resource. While there are several different CO2 storage classification systems that have been developed in recent years, over the course of this project, it was decided that four were most amenable to the development and application of storage coefficients; specifically, 1) the Techno-Economic Resource-Reserve pyramid developed by the CSLF, based on an approach that is hereby referred to as the CSLF method for estimating CO2 storage potential, 2) the DOE classification system developed for use in the Carbon Sequestration Atlas of the United States and Canada published by DOE, using an approach that will be referred to in this report as the DOE method, 3) the Petroleum Resources Management System (PRMS), and 4) the system described in IEA-GHG (2008) and referred to as the CO2CRC system. The framework for the system used in this paper, which is described more thoroughly in IEA-GFG (2009), is based on the PRMS and CO2CRC systems, while the terminology is based on that used in the DOE and CSLF systems.