Final answer:
To determine the number of bubbles on a level 0 logical DFD, identify all major business processes of the system, with each process represented by a single bubble.
Step-by-step explanation:
To determine how many bubbles belong on a level 0 logical Data Flow Diagram (DFD), you must understand the purpose and scope of the system being represented. The level 0 DFD, also known as the context diagram, represents the entire system as a single process and shows the system's interactions with external entities. Each bubble, or circle, on a DFD represents a major business process that handles data within the system. To ascertain the number of bubbles, identify all major business processes that the system will perform, ensuring none are omitted. Hence, the amount of bubbles on a level 0 DFD is directly related to the number of major processes that have been identified in the system's analysis phase.