The aim of the international project KATRIN (KArlsruhe TRItium Neutrino experiment) is to improve the sensitivity of determination of the electron neutrino rest mass by one order. KATRIN is a joint effort of several European and U. S. institutions. The number of people involved in KATRIN is still growing. Currently there are about 100 scientists, engineerings, technicians and students involved, including most of the groups that have worked on tritium beta-decay experiments in recent years. KATRIN is being built at Forschungszentrum Karlsruhe in Germany where much of the requiered technical infrastructure is already available, especially for the tritium source. and Otokar Dragoun.