Final answer:
The incorrect guideline for preparing data flow diagrams is to show the most detail in the context diagram, which should instead provide a high-level overview of the system. The other guidelines mentioned are correct, such as numbering process bubbles sequentially, including all storage files, and uniquely naming all data flows.
Step-by-step explanation:
Incorrect Guideline for Preparing Data Flow Diagrams
The question asks for identifying the guideline that is not correct for preparing data flow diagrams. When creating these diagrams, it is not considered a best practice to show the most detail in the context diagram. In fact, a context diagram should have the highest level of abstraction and only depict the overall system, its external entities, and the major data flows between them. Below are the clarifications of the other options provided:
- Sequentially number process bubbles: This helps in tracking and referring to processes easily within the data flow diagram.
- Include all storage files, even if they are only temporary: This ensures that all data stores are accounted for within the system being analyzed.
- Uniquely name all data flows: This is crucial for clear communication and to avoid confusion regarding the movement of data within the system.
The other components mentioned in the representations such as the budget for product development, drawings used to design a product, the engineering design process, and the rate of the flow of water through a hose, are not directly related to the guidelines for preparing data flow diagrams but may be relevant in specific DFDs depending on the system being analyzed.