Final answer:
The assertion regarding top-down partitioning of data flow diagrams (DFDs) is correct as it is a technique used to divide complex systems into more manageable components.
Step-by-step explanation:
The statement that the successive subdividing, or 'exploding,' of physical data flow diagrams (DFDs) is called top-down partitioning is true. In systems analysis and design, top-down partitioning is a method used to break down a complex system into progressively smaller pieces. This allows for easier management and understanding of the system's components and their interactions.
A physical data flow diagram, which shows how data moves within a system, can be detailed at different levels, with the highest level (context level) giving a broad overview, and lower levels (child diagrams) providing more detailed views. As analysts create lower-level DFDs, they apply top-down partitioning, gradually revealing details while managing complexity.