ARDENT is a multi-site ITN that will provide training for 15 ESRs in the field of advanced instrumentation for radiation dosimetry. This training initiative is founded on actions aiming to strengthen and enrich international cooperation amongst all partners involved (7 Full and 5 Associate), promoting the technological transfer of the research results to industry through the active involvement of four industrial partners (3 Full and 1 Associate). ARDENT focuses on three main technologies: gas detectors (gas electron multipliers and tissue equivalent proportional counters), solid state detectors (Medipix and silicon microdosimeters) and track detectors (CR-39 and nanodosimeters). It addresses the development of these types of instruments for mixed-field dosimetry, microdosimetry, spectrometry, beam monitoring. The applications range from the characterization of mixed radiation fields around particle accelerators, in particular accelerators for cancer therapy with electron, proton and carbon ions, on board commercial flights and in space, to the measurement of the secondary dose to patients undergoing radiation therapy, and can equally be employed for measurement of the properties of clinical hadron beams. The overall goal of ARDENT is to train young researchers in a sector that is very important for the future of European research, at the same time fostering the development of the European private sector. Some of the institutes involved in ARDENT have a long-standing bilateral collaboration but at present there is no global collaboration amongst all partners involved in this ITN. ARDENT therefore also represents an excellent opportunity to strengthen existing links and to create a new network among all partners. A series of network-wide activities, in terms of both training and collaborative research, and a strong programme of secondments are an essential part of this ITN. Several outreach activities complete the ARDENT programme.