The operation and maintenance of a hot-mixed asphaltic concrete plant is a difficult, ill-structured process. In order to maintain an efficient and economical operation, hot-mix plant managers and/or operators need a tool to assist in progressive maintenance and trouble shooting problems associated with the operation of the facility itself and with the quality of the produced mix. In this thesis a preliminary expert system for the operation and maintenance of a hot-mixed asphaltic concrete plant (HMAC plant) was developed. The software developed contains a three-part program. The first is a BASIC program that recommends routine maintenance and inspection procedures for individual plant components. The other two are expert systems developed for trouble shooting problems with the plant facility components and deficient hot-mix properties