---
title: "Rule-based expert systems · Artificial systems · Entities · Simulation Hypothesis"
url: https://simulation-hypothesis.com/entities/ai-expert
description: "Programs that encode a domain expert's knowledge as explicit if-then rules."
license: https://creativecommons.org/licenses/by/4.0/
credit: "Ross Allan Dahl, Simulation Hypothesis (simulation-hypothesis.com)"
---

[Entities](https://simulation-hypothesis.com/entities) › Artificial systems

# Rule-based expert systems

Programs that encode a domain expert's knowledge as explicit if-then rules. An inference engine applies the rules in sequence to reach conclusions, usually with an explanation of its reasoning.

Programs that encode a domain expert's knowledge as explicit if-then rules. An inference engine applies the rules in sequence to reach conclusions, usually with an explanation of its reasoning. People wrote down everything the system knows. It learns nothing from data. These programs were prominent in the 1970s-80s.

## Sources

* Buchanan BG, Shortliffe EH (1984). Rule-Based Expert Systems: The MYCIN Experiments. Addison-Wesley.

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