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A micro-computer based expert system in the field of construction planning of house building has been developed. This system encapsulates some of the knowledge experts in this field use for programming the production stage of low rise, traditional housing projects, and can be used by construction planners as a decision making supporting tool. The evaluation process devised for this system has focused on the validation of the planners' expertise model. This paper reviews some of the fundamental concepts related to the problem of evaluating expert systems. Some of the techniques that have been used in the validation of such systems are described, and the main conditions and constraints concerning the application of knowledge engineering in the field of construction planning are discussed. A prescriptive approach for the validation of the developed system is proposed. This approach includes both qualitative validation techniques and the development of a method for the continual validation of the system during its life cycle.