sentences:  The TGDC draft guidelines require software independence for all voting systems, in order to allow the correct outcome of an election to be determined even in the face of software bugs or vulnerabilities.According to the TGDC draft, software independence can be achieved through the use of independent voter verifiable records (IVVR) or through the innovation class.Additionally, the TGDC draft recommends open-ended vulnerability testing (OEVT), a testing method designed to bring greater security to voting systems in the polling place.