RACER is the only commercially available, integrated cost estimating software for estimating the costs of environmental remediation projects from studies through system operations and maintenance (O&M). RACER provides the detail and accuracy of manual estimates, but is faster, less error prone, and more efficient in comparing alternatives. RACER has been used in estimating over $10 billion of remediation projects. Its accuracy has proven to be within 10 percent of actual completed project costs. The system currently has over 1,000 users. The software was developed in 1991 and is updated and validated annually. It is endorsed by EPA, DOE, DOD, and many state agencies as a preferred estimating and negotiating tool.