This call for tenders concerns the provision of localization services in relation to UPU software packages, such as the International Postal System and Customs Declaration System, in various languages over a four-year period. The languages most frequently required are French, Portuguese, Russian and Spanish, but others may be needed on a project-by-project basis. These services encompass translation and verification of con-tent, updating and maintaining translation memories, and project management, and may relate to user inter-faces, help systems and user guides.