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This Technical Report is an implementation guide to EN 13850 for use by postal operators, regulators and those responsible for commissioning, carrying out, or auditing the measurement of postal service quality. It gives information, which will facilitate the implementation of EN 13850. It gives an overview of the processes required and factors to consider when measuring quality of service. It provides guidance on alternative approaches allowed in the Standard including how to select and calculate alternative or additional discriminant factors and methods for weighting of strata. It describes a process for implementation of the measurement system, and provides examples and clarification on specific requirements of EN 13850. It gives information on how to interpret the test results obtained by measurement according to the standard. This Technical Report does not alter in any way the requirements of EN 13850. It is concerned with technical issues in the implementation of the measurement system. The Technical Report provides guidance but it does not specify how the regulators shall enforce and monitor the use of the standard since this is the responsibility of the European Commission and the national regulatory authorities themselves. Parts of this Technical Report may also be considered for guidance when implementing the following quality of service standards: -- prCEN/TS 14773 Postal services - Quality of service - Measurement of loss of non-registered mail -- EN 14508 Postal services - Quality of service - Measurement of the transit time of end-to-end services for single piece non-priority and second class mail -- prEN 14534 Postal services - Quality of service - Measurement of the transit time of end-to-end services for bulk mail