Abstract: In this paper, we focus on conceptual data modeling and logical
database modeling of fuzzy information. The IFO data model is extended with
fuzzy set theory to cope with imperfect as well as with complex objects in the
real world at a conceptual level. Concerning the logical database modeling of
fuzzy information, we focus on the object-oriented database model. Some major
notions in the object-oriented databases such as objects, classes,
objects-classes relationships, supertype/subtype, and multiple inheritances are
extended under fuzzy information environment, and a generic model for fuzzy
object-oriented databases is developed. In particular, we develop the formal
approach to mapping a fuzzy IFO (IF_{2}O) model to a fuzzy
object-oriented database schema. Therefore, one can conduct the conceptual
design of a database model with fuzzy information and then transform it into
the logical database model.
