In October 2003, Indiana University proposed to connect a portion of the Indiana University computer and visualization resources to a National Science Foundation (NSF) project called the Distributed Terascale Facility (DTF). At that time, there were five sites connected to the DTF: Argonne National Labs (ANL); San Diego Supercomputing Center (SDSC); National Center for Supercomputing Applications (NCSA); Caltech; and Pittsburgh Supercomputing Center (PSC). They were collectively known as the Extensible Terascale Facility (ETF). The NSF jointly awarded Indiana University and Purdue University grants to connect both campus resources to the TeraGrid. This collaboration is known as the Indiana University Research Network.