ELIZA (1966) › From Theory to Practice: The First Attempt at the Turing Test

Just sixteen years after Turing proposed his test for machine intelligence, Joseph Weizenbaum at MIT created ELIZA, an early working program for natural language conversation. Released in 1966, ELIZA put part of Turing's theoretical challenge into practice. Simple pattern matching and response templates produced exchanges that some users interpreted as understanding.

ELIZA offered an early practical demonstration of natural language dialogue between a person and a computer. Turing had provided a conceptual test; ELIZA implemented part of that proposal in a working system. Some users treated its mechanically generated exchanges as human-like.

ELIZA appeared as interactive computing was becoming possible. By the mid-1960s, computers had evolved from room-sized calculators into machines capable of interactive use, and researchers were beginning to explore whether they could move beyond numerical computation to tackle tasks involving language and meaning. Weizenbaum, a German-born computer scientist who had witnessed firsthand the rise of both fascism and technological determinism, approached the project with a mixture of technical curiosity and philosophical skepticism. He wanted to demonstrate the possibilities of human-computer interaction, but he also harbored deep concerns about the implications of machines that might seem to understand when they fundamentally did not.

What Weizenbaum created would both fulfill and exceed his expectations in unexpected ways. ELIZA would prove remarkably effective at creating the illusion of understanding, but the intensity of people's emotional responses to the program would trouble its creator for the rest of his life.