Dfd Diagram Level 0. Context diagram level 0. 10 sale customer order sales forecast customer order product ordered serve product payment collect payment 20 production customer employee production schedule product served produce product.
If you think you have enough information draw a level 0 diagram such as the one found in figure 2. It is a level 0 dfd which is also referred to as a context diagram. Data flow diagram levels.
Data flow diagram represent detailed and well explained diagram of system components.
Its designed to be an at a glance view showing the system as a single high level process with its relationship to external entities. It is usually beginning with a context diagram as level 0 of the dfd diagram a simple representation of the whole system. This dfd level focuses on high level system processes or functions and the data sources that flow to or from them. It also contains data stores external entities and data flows.