It is our pleasure to welcome you to the 3rd International Proficiency Testing Conference, which will be held on (27)28-30 September 2011, at Iasi in Romania. The 3rd International Proficiency Testing Conference aims to develop and bring together a diverse community from academia, research laboratories, supplier bodies of PT schemes, laboratories of analyses and tests, industry, from worldwide and from all ranges (aggregates, chemistry, electrotechnics,