GAVI has also developed an innovative outcome-based funding system for their immunization support grants. Countries initially receive a three-year investment based on a specific vaccine target. While countries have flexibility in allocating the immunization support funds, all progress is measured by the countrys DTP-3 immunization rate. By choosing one benchmark, GAVI has simplified its accountability system. Since DTP-3 is a basic immunization that all children should receive, GAVI uses the DTP-3 immunization rate as a measure of a countrys immunization infrastructure. Countries receiving funding must reliably report increased DTP-3 coverage rates to renew funding after the initial three-year investment. GAVI has also developed a Data Quality Audit process to ensure accountability. Outside auditors examine health records to verify the level of basic immunizations.