[en] Purpose: Defining the user requirements for tele-nuclear medicine systems, in particular in developing countries, is an important prerequisite to establishing a service. However, the availability of low cost PC based servers and, now, access to local ISPs, has made the technical provision of such networks relatively simple and low cost, although transfer of data to and form legacy systems still present many difficulties. Method and Materials: The key driving force in developing countries is the imbalance between skills in the relatively few centres of excellence and the increasing number of installations overall. Requirements include both very rapid remote reporting and/or overnight tele-consultation. Original raw NM data must be available not just 'images'. Using current network standards (VPN) data transfer rate requirements are low. Provision of image fusion between NM, CT and MRI is also highly desirable. Results: Experience has been obtained e.g. in Thailand and Morocco, where a network of servers and remote users, with cardiac application of particular importance, has demonstrated benefit, and increasing volumes of usage. Conclusions: However, the requirements need to be clearly defined, and a staff training program is essential, as is a full evaluation. The transfer of skills is important in raising the overall quality of health care