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For enhancing the efficiency of processing users' queries, all Database Management Systems (DBMSs) must conduct query pre-processing, or query optimizing. This book proposes a new model for the Fuzzy Object Oriented DBMS (FOO-DBMS), which optimizes the query statements and processes the data before returning back to users based on Fuzzy-Object-Algebra and equivalent transformation rules. Discussions on this model are also presented with computation and analysis.