Australia is ranked in the top five countries in the fields of ground-based optical and radio astronomy. CSIRO's Australia Telescope National Facility (ATNF) is the largest astronomical institution in Australia, and the pre-eminent radio astronomy facility. Observing time on the ATNF's telescopes is awarded to researchers on the basis of the merits of their proposed research programs; eighty percent of the telescopes' users come from outside CSIRO. The ATNF's focus is on developing and maintaining its facilities at a world-class level and providing a showcase for Australian technology.