DIN EN 14137:2004-01

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Measurement
  4.1 General
  4.2 Minimum period before an item is considered to be
      lost or substantially delayed
  4.3 Calculation of number of lost or substantially
      delayed items
  4.4 Information to be recorded for domestic mail
  4.5 Information to be recorded for cross-border mail
5 Methodology
  5.1 Monitoring system
  5.2 Items not reported as delivered
  5.3 Items incorrectly recorded as delivered
  5.4 Items not recorded on the monitoring system
  5.5 Accuracy requirements
6 Reporting
  6.1 General
  6.2 Domestic mail
  6.3 Cross-border mail
7 Quality control
Annex A (normative) Calculation of accuracy
  A.1 Calculation of loss rate
  A.2 Accuracy of the loss rate
  A.3 Estimation of accuracy
Annex B (informative) Calculation of loss of registered
        mail
Bibliography

Provides methods for measuring the level of loss and substantial delay of domestic and cross-border registered letter mail, collected, processes and delivered by postal service providers.