Final answer:
The Context diagram is the least detailed of the data flow diagrams, presenting a simplified view of the entire system, whereas Level 0, Level 1, and Level 2 diagrams provide progressively more detail.
Step-by-step explanation:
The least detailed of the data flow diagrams is the Context diagram. Data flow diagrams are used to visually represent the flow of data within a system and to show how information is processed and interchanged among various system components. In the hierarchy of data flow diagrams, the context diagram stands at the highest level, providing a simplified view of the entire system, with a single process node representing all system activities and external entities that interact with the system. As you move from a context diagram to Level 0, Level 1, and Level 2 diagrams, the level of detail increases with each step.
The Level 0 diagram, also known as the 'Fundamental System Model' or 'Level 0 DFD', provides a slightly more detailed overview, showing major system processes and their relationships. Level 1 and Level 2 diagrams decompose processes from Level 0 into more detailed sub-processes, aiding in the complexity management of the system's flow of information.