To receive an ISO9000 certification a company must put the required QMS processes and controls in place, monitor performance of its processes and demonstrate continual improvement. Most companies hire an experienced consulting firm to assist with these preparations. Once the QMS is in place, a registrar (or certification body) is hired to audit the company's compliance with ISO9000 requirements. If discrepancies are found during the audit, they must be corrected before the ISO9000 certificate is issued. The ISO9000 certification must be maintained through regular audits (bi-annual or annual) conducted by the selected registrar.