Atlas record: https://www.aitimeline.dev/en/events/evt-0040/
Research · January 1966
Joseph Weizenbaum published a program that held an English conversation using text patterns.
ELIZA showed that simple pattern substitution can create an impression of understanding — an early documented observation about how people trust conversational systems.
The program has no world model and no grasp of meaning. The author later wrote separately about the risk of attributing understanding to machines.
Communications of the ACM · Published January 1966
ACM (scan hosted by a third-party site) · Published January 1966
ELIZA later used the same pattern-matching device.
Both examine how a conversation with a machine is perceived by people; Weizenbaum documents the impression it creates.
RFC 439, 'PARRY Encounters the DOCTOR', reproduces PARRY's conversation of 18 September 1972 with DOCTOR, ELIZA's psychotherapist script.
Both address machine processing of natural language, but by different means: patterns versus logical inference.
The book was written after the author saw how people reacted to his own ELIZA program.
The same gap between a convincing answer and understanding that ELIZA exposed.
Shieber writes that the programs' devices, repeating earlier statements and answers keyed to trigger words, the 'tricks of the eliza trade', were ubiquitous.