I am pleased to introduce this publication based on one of the deliverables of the NO PROBLEMS project. This is one of the projects co-financed by the European Commission in the framework of the TEN-Telecom programme. Electronic commerce is high up on the agenda of the European Commission and is one of the priorities of the TEN-Telecom programme. Electronic commerce requires a reliable and secure communications environment. But in order to attract the large number of Europe's SMEs and the European citizens, electronic commerce support services must be widely accessible at low cost. The NO...