Question

Which of the following statements related to the construction of data flow diagrams (DFDs) is false?

a. The level 0 diagram is the next level down from the context diagram.
b. If the level 0 diagram has one arrow going into bubble number 1.0 and two arrows leaving bubble number 1.0, then diagram 1.0 will show one arrow entering and two arrows leaving.
c. Sources and destinations are depicted by parallel horizontal lines, between which the name of the entity is shown.
d. Arrows represent a pathway for data.

Answer 1

The false statement in the context of data flow diagrams is that sources and destinations are depicted by parallel horizontal lines; they are actually represented by rectangles or squares.

Step-by-step explanation:

The statement related to the construction of data flow diagrams (DFDs) that is false is: Sources and destinations are depicted by parallel horizontal lines, between which the name of the entity is shown. This is not accurate; in DFDs, sources and destinations, also known as external entities, are typically represented by rectangles or squares, not parallel lines. The other statements are correct: The level 0 diagram is indeed the next level down from the context diagram, providing a more detailed view of the system's major processes and data flows. Additionally, if the level 0 diagram has specific movements of data depicted with arrows going into and out of a process, these should be reflected in the same manner in the lower-level diagrams of that process. Lastly, arrows do indeed represent pathways for data within the diagram.