重新命名新的DFD。右键点击它的背景并选择Rename…在关系图的名称框中,输入Level 1 DFD并按回车键。 在中心创建三个流程(流程订单、发货、收货),如下图所示。那是系统过程的老地方,我们把它们放在那里来阐述系统。 连接数据流的连接线 本节中的其余步骤是关于连接图中的模型元素的。例如,客户在下订单进行处理时...
顶层DFD(Context Diagram):这是数据流图的最高层级,展示了整个系统的外部实体、主要过程及其之间的交互关系。 分层DFD(Level 1 DFD):在顶层DFD基础上,进一步细化主要过程,展示内部的子过程和数据流。 更详细的DFD(Level 2 DFD及以下):继续细化子过程,展示更深入的细节,直到达到所需的细节级别。 数据流图的实际应...
Context DFD is sometimes referred to as level 0 DFD. It’s the top-level diagram among all, which illustrates the entire system in its relationship to any external entities. Data Flow Diagram Level 1 Level 1 DFD is the level under the context-DFD. It illustrates the main functions within ...
Level 0 DFDThe DFD level 0, also known as context diagrams, is the most typical and understandable DFDs. This DFD level primarily concerns high-level system operations and the data sources that flow to or from them.Level 1 DFDThe DFD level 1 provides a more in-depth look at the system ...
藉由執行以下三個步驟,你就會了解如何 產生一套DFD : 第一步: 繪製環境圖(context diagram #) 第二步: 繪製DFD的圖0 (diagram 0 #或 level 0 diagram) (即環境圖之分解圖) 第三步: 繪製較低階層的圖形。 21 繪製一組DFD的方法 繪圖DFD的準則: 1. 每一張環境圖必須以一頁的篇幅完成。 2. ...
Level 0. Also known as a context diagram, this is the highest level and shows a simple, top-level view of the system being represented. Level 1. This is still a relatively broad view of the system, but it incorporates subprocesses and more detail. Level 2. Provides even more detail and...
–第0階(level0)DFD:將上述單一bubble分解成 1.0、2.0、3.0…等數個子系統。 –再細分:將上述子系統進一步分解成1.1、1.2、 2.1、2.2、3.1、3.2、3.3…等子系統。 國立屏東大學會計學系周國華8 背景圖(ContextDiagram) •背景圖的通用樣式如下: 國立屏東大學會計學系周國華9 ...
Steps to Draw a DFD Start with a Context Diagram: Begin with the highest level (Level 0 DFD) showing the system and its interaction with external entities. Decompose into Lower Levels: Break down the system into more detailed DFDs (Level 1, Level 2, etc.) to provide a deeper ...
2. Build a context diagram (Level 0 DFD) You could achieve this by drawing a single process node and connecting it to related external entities. The node represents the general process information undergoes in a system from input to output. 3. Expand the context diagram into a level 1 DFD...
It is usually beginning with a context diagram as level 0 of the DFD diagram, a simple representation of the whole system. To elaborate further from that, we drill down to a level 1 diagram with lower-level functions decomposed from the major functions of the system. This could continue to...