Erman, Hayes-Roth, Lesser and Reddy: the Hearsay-II speech-understanding system

What changed

Described Hearsay-II hypothesis construction using opportunistic interacting knowledge sources.

Scientific scope

The record is the exact four-author 1980 ACM Computing Surveys article. It does not absorb every Hearsay contributor, all blackboard systems, later speech recognizers or accuracy claims beyond the reported system.

Evidence

The linked sources identify this contribution and its scope. WRS has not independently reconstructed the scientific claims. The record is the exact four-author 1980 ACM Computing Surveys article. It does not absorb every Hearsay contributor, all blackboard systems, later speech recognizers or accuracy claims beyond the reported system.

Contributors

• Lee D. Erman · SCIENCE: Named source author of the scoped work; individual effort shares are not measured.
• Frederick Hayes-Roth · SCIENCE: Named source author of the scoped work; individual effort shares are not measured.
• Victor R. Lesser · SCIENCE: Named source author of the scoped work; individual effort shares are not measured.
• D. Raj Reddy · SCIENCE: Named source author of the scoped work; individual effort shares are not measured.

• ACM record for the Hearsay-II system

Provisional WRS assessment, edition 2026-10-16.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.

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