SLIP (programming language)

SLIP, short for Symmetric List Processor, is a list-processing programming language invented by Joseph Weizenbaum in the 1960s. Rather than standing alone, SLIP was implemented as an extension first to Fortran and later embedded into the MAD and ALGOL languages, adding symmetric doubly linked list structures for manipulating data. SLIP's best known use was in ELIZA, the early natural language processing program Weizenbaum created at the MIT Artificial Intelligence Laboratory to simulate a Rogerian psychotherapist through simple pattern matching. Detailed bibliographic facts such as SLIP's exact paradigm classification, typing discipline and license are not established in its lead source and are recorded here as an honest gap rather than guessed.