Richard M. Heiberger Emacs Speaks Statistics: One Interface - Many Programs ****************************************************** Emacs Speaks Statistics (ESS) is a user interface for developing statistical applications and performing data analysis using any of several powerful statistical programming languages: currently, S, S-Plus, R, SAS, XLispStat, Stata. ESS provides a common editing environment, tailored to the grammar of each statistical language, and similar execution environments, in which the statistical program is run under the control of Emacs. The paper discusses the capabilities and advantages of using ESS as the primary interface for statistical programming, and the design issues addressed in providing a common interface for differently structured languages on different computational platforms.