Data modeling is useful in representing and documenting data. It is required that data modeling tool is extended in order to describe the imprecision and uncertainty in engineering design and manufacturing. The IDEF1X technique lends itself to the design and implementation of data models. IDEF1X has gained acceptance in numerous commercial and government establishments.
In this chapter, IDEF1X model has been extended to describe imprecise and uncertain information in the real world. A special focus is on the fuzzy extension. Based on three levels of fuzziness, the basic elements in these three kinds of data models are hereby redefined and the corresponding graphical representations are developed.