The successive subdivision, or exploding, of logical data flow diagrams (DFDs) is called bottom up partitioning.

Name: The successive subdivision, or exploding, of logical data flow diagrams (DFDs) is called bottom up partitioning.
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The statement is incorrect. The successive subdivision of DFDs is called top-down partitioning, where the highest-level DFD is gradually decomposed into lower-level ones. Bottom-up partitioning, on the other hand, starts from the lowest level and builds up the hierarchy.

The Successive Subdivision, or Exploding, of Logical Data Flow Diagrams