The JR3 and N5 ILIAS activities supported the merging of the European scientific communities involved in the gravitational wave (GW) detection research; this permitted the realization and the submission of the successful ET proposal, that now is started as design study, supported by the European commission within the Framework Programme 7. The main target of this meeting is to permit the transfer of the ILIAS heritage to the ET working groups. For this reaseon the ET and ILIAS sessions are interlaced. The ET science case, the achievements of the thermal noise R & D in JR3 and their significance fo ET, the infrastructure issues of a 3rd generation GW detector, the GW sources and the ET design study organization will be discused.
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