VLTI System Upgrades: Recent Engineering Progress and Future Developments Luis Esteras Otal, Jose Antonio Abad,Roberto Abuter, Patricio Alarcon,Emmanuel Aller-Carpentier,Fatme Allouche, Juan Araneda, Helen Bedigan, Juan Beltran,Anthony Berdeu, Leonardo Blanco,Henri Bonnet,Guillaume Bourdarot,Pierre Bourget, Ivan Camara Mayorga, César Cárdenas, Yael Chich-Prunenec,Alain Delboulbé, Diego Del Valle, Françoise Delplancke-Ströbele,Denis Defrère,Roderick Dembet, Nicolas Dubost, Cristian Elao,Frank Eisenhauer, Fabricius,Helmut Feuchtgruber, Quentin Fournier, Christian Fruck,Eloy Fuenteseca, Rebeca Garcia Lopez, Daniel Gaytan, Reinhard Genzel,Juan Pablo Gil,Stefan Gillessen,Frédéric Gonté, Vishaal Gopinath, Jonas Graf, Pablo Gutierrez Cheetham, Ivan Maria Guidolin,Wolfgang Hackenberg,Xavier Haubois,Frank Haussmann, Cristian Herrera, Pascale Hibon,Ronald Holzlöhner, Stefan Huber,Jens Kammerer,Johann Kolb,Peter Krempl,Lucas Labadie,Sylvestre Lacour,Romain Laugier, Jean Baptiste Le Bouquin, Dieter Lutz,Antoine Mérand, Saúl Menéndez Mendoza,Florentin Millour, Nikhil More, Nuno Morujão,Sylvain Oberti, Francisco Olivares,Thomas Ott,Laurent Pallanca, Thibaut Paumard, Marcus Pavez, Felipe Pedreros Bustos, Dan Popovic,Christian Rau, Claudio Reinero,Miguel Riquelme,Sylvain Rochat, Casper Rose,Joel Sánchez Bermúdez, Malte Scherbarth,Nicolas Schuhler,Babak Sedghi,Pavel Shchekaturov, Taro Shimizu,Christian Straubmeier, Matthias Subroweit,Mario Tapia, Pierre van der Heyden, Ekki Wieprecht,Julien Woillez,Gérard Zins