Christine Mer from CEA talks about the importance of the ENTRANCE Field Tests and some of the planning and technical aspects that have gone into bringing the various Non-Intrusive Inspection technologies together in the three week test programme near the commercial port of Rijeka in Croatia. The whole organising team has worked closely with the technical partners and Croatia Customs to ensure the technologies are tested in real and optimal conditions. Real weapons, explosive and radioactive sources were used in the tests to make sure the equipment was really put through its paces and could be fully assessed as to their effectiveness and accuracy of results.