Upon Client's written request, POS shall provide Client's external and/or internal auditors with access to Client Data in the possession of POS, as necessary for Client external and/or internal auditors to conduct its audit; provide that the external and/or internal auditors may not use or disclose any of POS proprietary methodologies which may by disclosed in the course of providing such access. If requested by Client as Additional Services, POS shall provide to such external and/or internal auditors any assistance that they might reasonably require in conjunction with such audits. Subject to Client approval and as a part of the Additional Services to be separately agreed to, POS shall make all reasonable changes requested by, and take any other reasonable action necessitated by, any such audit or examination. Access by any third party to POS's tools, procedures, methodologies or work papers will be subject to the requirements of POS's standard policies regarding granting access to its confidential information or work papers.