HADES (Haskins Analysis Display and Experiment System) refers to a family of signal processing computer programs that was developed in the 1980s at Haskins Laboratories by Philip Rubin and colleagues to provide for the display and analysis of multiple channel physiological, speech, and other sampled data in an experimental context. Principal programmers over the years on this project included Vance Maverick, Mark Tiede , Marian Pressler, and Simon Levy . The most significant feature of HADES was the incorporation of a procedural language known as SPIEL (Signal Processing Interactive Editing Language) that provided for the creation and customization of specialized analysis procedures that can be stored as text files, edited, etc., and are similar to functions and subroutines in programming