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This paper presents a microcomputer-based diagnostic system (MBDS), designed for identifying students' conceptions in the domain of heat and temperature. The MBDS consists of three major parts: the input unit, the rule-base and the students' knowledge profile. These parts are described and illustrated. In addition, the four phases of developing the MBDS--the preliminary empirical study, the construction of the rule-base, the production of the system, and its evaluation--are briefly described.
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