| Summary: | Approved for public release, distribution unlimited === All original copies missing. Best digital copy available. === The development of a prototype knowledge-based expert system to assist safety analyses of short term, trench excavations on light commercial construction projects is presented. Background information for trench excavation hazards, OSHA safety compliance regulations, in-the-field soils analysis techniques, timber shoring design, and expert system development is introduced. Detailed discussion of the design and construction of a knowledge base for the safety analyses of short term trench excavations is included along with the methods involved in loading the knowledge base onto an expert system shell.
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