Final answer:
Decomposition is the process of successively subdividing logical data flow diagrams into more detailed sub-systems, which helps in better analysis and design of information systems.
Step-by-step explanation:
The successive subdivision, or exploding, of logical data flow diagrams (DFDs) is called decomposition. This process involves breaking down a complex system into more manageable and detailed sub-systems. By doing this, analysts can understand and represent a system at various levels of detail, making it easier to analyze and design information systems. Decomposition in the context of DFDs allows for the exploration of all parts of the system, ensuring that finer details are not overlooked during system development.
The successive subdivision, or exploding, of logical data flow diagrams (DFDs) is called levelling. Levelling involves breaking down a complex DFD into smaller, more detailed DFDs by refining processes, further identifying data stores, and expanding on information flows. This helps in analyzing and understanding the system or process being depicted in the DFD.
For example, if we have an initial high-level DFD of an online shopping system, we can then level it by breaking down the different processes involved like account creation, product selection, payment, and order fulfillment into separate DFDs. This provides a clearer and more detailed view of each process and the interactions between them.
In the levelling process, each process in the high-level DFD is expanded into a separate child diagram to show further data flows and processes. This allows for more detailed analysis, testing, and refinement of the system before implementation.