What was the primary success metric for ELIZA, an early simulation system?

Answer

Its ability to sustain the illusion of conversation

Unlike systems designed for utility, such as DIALOG, or task completion, like SHRDLU, ELIZA was engineered specifically to mimic human conversational roles. Therefore, its success was not measured by factual accuracy or task completion rates, but rather by its capacity to maintain the illusion that the user was interacting with an understanding entity. This focus on sustained engagement, achieved through simple reflective techniques, introduced entirely new, often subjective, metrics for evaluating conversational AI performance that focused on perceived conversational quality rather than objective correctness.

What was the primary success metric for ELIZA, an early simulation system?
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