User support for the ALMA project is organized through three ALMA Regional Centers (ARCs), in North America, in East Asia, and in Europe. The European ARC consists of a core at ESO, Garching, and a network of seven nodes and one center of expertise. The ARC nodes are primarily responsible for general user support of the European ALMA users, and each have several areas of expertise.
Allegro (ALMA Local Expertise GROup), the European ARC node in the Netherlands, is hosted by Leiden Observatory and established together with the Netherlands Research School for Astronomy (NOVA), and the Physical Sciences division of the Netherlands Organizations for Scientific Research (NWO/EW). Allegro integrates the expertise relevant to ALMA within the astronomical institutions and universities in the Netherlands. This includes the astronomy departments of the Dutch universities cooperating as the Netherlands Research School for Astronomy (NOVA), the Netherlands Foundation for Research in Astronomy (ASTRON), the Netherlands Institute for Space Research (SRON) and the Joint Institute for VLBI in Europe (JIVE).