Expert System for Construction Safety. II: Knowledge Base

In this study, a fault‐tree expert system for construction fall (FTES‐FALL) was developed to simulate and investigate unintentional construction falls from floor openings. Fault‐tree models constructed in an earlier study were used as the knowledge representation for FTES‐FALL. The knowledge base accommodates expertise obtained from experts and literature. A step‐by‐step process in developing the knowledge base was presented. Prompts were designed to lead the user to finding information/evidence needed to reach a conclusion. Parameters were identified and classified, leading to the establishment of frame‐subframe relations. Each frame contains production rules that represent the expert knowledge. In addition, abundant help statements were provided to guide the user through the consultation process. FTES‐FALL was tested by the knowledge engineer for its accuracy, completeness, efficiency, and user‐friendliness. Although FTES‐FALL is still in its development stage, it has demonstrated its capability to assist an investigator in finding the cause(s) of construction falls.