PART TWO MEASUREMENT, REPORTING, AND RECORD KEEPING 6. Measurement Methods 1) Telecommunications Operators shall establish measurement methods consistent with this Directive. 2) The measurement of quality of service parameters shall be based on the measurement methods stated in Appendix I of this Directive. 3) The parameters referred to in Sub-Article (2) of this Directive may be reviewed and amended, from time to time, by the Authority subject to consultation with Telecommunications Operators and in accordance with international best practice. 4) Telecommunications Operators shall allow the Authority to access its trouble ticketing system for Customer service provisioning and complaints during audit processes. 5) Test calls measurement shall be made using drive-tests or other test units as determined by the Authority. 7. Reporting Telecommunications Operators shall: 1) Submit a Quality of Service report on the Quality of Service benchmarks for all the parameters in the format to be prescribed by the Authority on a quarterly basis, ending March 31, June 30, September 30, and December 31, but not later than thirty (30) working days from the end of the Quarter. The Authority may review, from time to time, the frequency and the format of such report; 2) Specify in the report the manner in which the sampling was done with sufficient detail to enable the Authority to verify the accuracy of the report; and, 3) Be required to provide the network coverage and overall network performance on a Quarterly basis to the Authority based on data from their network operations and maintenance facilities; and, 8. Record Keeping 1) Telecommunications Operators shall maintain: a) Documented processes of data collection for each Quality of Service parameter contained in the Directive and submit to the Authority as required; b) Complete and accurate records of their compliance of each Quality of Service parameter specified in such a manner and in such a format, as may be prescribed by the Authority from time to time; and, c) Quality of Service data, including all measurements and related records, for a minimum of twelve (12) months after the end of the Reporting Period or as may be directed by the Authority. 2) The Authority may, subject to consultation with Telecommunications Operators, specify uniform record keeping procedures and formats including guidelines on measurement methodology for various Quality of Service Standards; 4