Between Congresses, the POC and CA work hand in hand to study possible changes to the remuneration systems, ultimately leading to the submission of carefully negotiated proposals. These changes are supported by various technical studies developed by the International Bureau, in coordination with the relevant POC and CA bodies, based on data from surveys and questionnaires sent to member countries.
Studies are password-protected in the UPU documentation centre, owing to confidentiality issues
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POC/CA documents - Istanbul cycle studies
| Title | Document |
| Results of the study on transportation costs associated with surface mails in transit | POC C 2 2020.1–Doc 4a |
| Results of the study on the cost of handling mails in closed transit, items received in transit à découvert, missent items and misrouted receptacle | POC C 2 2020.1–Doc 4b |
| Title | Document |
| Update of the results of the IPK study | POC C 2 2019.1–Doc 4a |
| Conclusions from the items per kilogramme study | POC C 2 2019.1–Doc 4b |
| Results of the domestic tariff study | POC C 2 2019.1–Doc 4c |
| Results of the study on the costs of providing inbound basic and supplementary services | POC C 2 2019.1–Doc 4d |
| Conclusions from the cost and tariff study | POC C 2 2019.1–Doc 4e |
| Results of the market impact survey | CA C 2 2019.1–Doc 7a |
| Results of the mail flow study | POC C 2 2019.2–Doc 4a |
| Results of the survey to assess operational and financial impacts | CA C 2 2019.2–Doc 7 |
| Title | Document |
| Results of the survey on the costs of handling, transporting and delivering small-packet items | POC C 2 2018.1–Doc 4a |
| Results of the items per kilogramme (IPK) study | POC C 2 2018.2–Doc 4a |
| Title | Document |
| Comparative study on the UPU remuneration systems for similar weight items | POC C 2 2017.2–Doc 4c |
The publication Terminal Dues – New Frontiers for a Changing World considers the evolution of the UPU’s terminal dues system over the last 50 years from its origins to the present day, and analyzes the major policy and market factors that have shaped, and continue to shape, the evolution of this pillar of the global postal network.