Final answer:
The number of bubbles used in a logical data flow diagram (DFD) depends on the system's complexity and level of detail required. The goal is to strike a balance between providing enough detail and keeping the diagram concise.
Step-by-step explanation:
When creating a logical data flow diagram (DFD), the number of bubbles used should depend on the complexity and level of detail needed to represent the system accurately.
In general, a DFD should have enough bubbles to clearly represent the major processes, data stores, and data flows within the system. It is important to strike a balance between providing enough detail for understanding and keeping the diagram readable and concise.
For simple systems, a DFD may only consist of a few bubbles representing the main processes and data stores. However, for complex systems, multiple levels of decomposition may be necessary, resulting in a larger number of bubbles.
Ultimately, the number of bubbles used in a DFD is subjective and should be determined based on the specific requirements of the system and the level of complexity that needs to be communicated.