Qualifier-2: Knowledge-based system for contractor prequalification

Among other concerns, contractor prequalification involves the evaluation of a candidate contractor’s reputation, past performance, financial stability, experience record, firm capacity, current workload, and technical expertise. Qualifier-2, a prototype knowledge-based expert system that aids construction owners in performing contractor prequalification, is presented in this paper. A description of a previously developed algorithmic model for contractor prequalification, Qualifier-1, is also discussed and its shortcoming are outlined. The hierarchical decision model applied in Qualifier-2 is described along with sample decision rules implemented within the developed system followed by a description of the prototype system’s structure and facilities. The system prompts the user for pertinent contractor data and performs the evaluation. A help, explanation, and recommendation facility have been included to aid the user during a consultation. The system provides an automated contractor evaluation process through which rational and consistent prequalification decisions can be made.