The following is a National Science Foundation (NSF) Dear Colleague Letter (DCL) by the Directorate for Computer & Information Science & Engineering (CISE) Acting Assistant Director, Dr. Suzanne Iacono. Through its CISE Research Infrastructure (CRI) program (NSF 14-593 http://www.nsf.gov/publications/pub_summ.jsp?ods_key=nsf14593), the NSF Directorate for Computer and Information Science and Engineering (CISE) supports world-class research infrastructure enabling focused research agendas in computer and information science and engineering. The CRI program funds both the creation of new infrastructure as well as the enhancement of existing infrastructure. For more information, please visit http://www.cccblog.org/2014/10/22/nsf-cise-research-infrastructure-cri-program/.