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Examines the problems of applying fuzzy logic to control applications where each application is different from the previous one and looks at the development of a unique system of fuzzy logic based on an existing software package. The system comes in two alternative forms; the first is a fully configurable fuzzy set for the OEM designer which, for example, could be used to control the temperature of a large oven and the second reduces the fuzzy function down to the most basic level where no process knowledge is required. Describes the tests carried out in order to determine the linguistic variables which apply to general control applications. Concludes that fuzzy logic begins to take effect in those situation to which normal control algorithms PD, PID functions have difficulty adjusting.