COMASTRI, AndreaAndreaCOMASTRI2020-05-182020-05-182016http://hdl.handle.net/20.500.12386/24913I will summarize the most relevant achievements of the ultra deep XMM survey in the Chandra Deep Field South and the lessons learned for the planning of future X-ray surveys.1 - VideoELETTRONICO1 - DigitaleenMultimediahttps://www.cosmos.esa.int/web/xmm-newton/2016-workshop#presentations2016xnnd.confE..17CFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation