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The data-flow diagram is a tool that is part of structured analysis and data modeling. When using UML, the activity diagram typically takes over the role of the data-flow diagram. A special form of data-flow plan is a site-oriented data-flow plan. Data-flow diagrams can be regarded as inverted Petri nets, because places in such networks ...
Data-Flow Diagram example [19] A data-flow diagram (DFD) is a graphical representation of the "flow" of data through an information system. It differs from the flowchart as it shows the data flow instead of the control flow of the program. A data-flow diagram can also be used for the visualization of data processing (structured design).
An example of a Top Level Context Diagram for an information system management process is shown in Figure 3. From this diagram lower-level diagrams are generated. An example of a derived diagram, called a “child” in IDEF0 terminology, for a life cycle function is shown in Figure 4. [1]
This context-level data flow diagram is then "exploded" to show more detail of the system being modeled. Data flow diagrams (DFDs) are one of the three essential perspectives of structured systems analysis and design method (SSADM). The sponsor of a project and the end users will need to be briefed and consulted throughout all stages of a ...
Decision trees and data storage are represented in system flow diagrams. A context diagram can also list the classifications of the external entities as one of a set of simple categories [5] (Examples: [6]), which add clarity to the level of involvement of the entity with regards to the system. These categories include:
The viewpoints are organized according to their hierarchical level: [2] [3] Context diagrams (level 1): show the system in scope and its relationship with users and other systems; Container diagrams (level 2): decompose a system into interrelated containers. A container represents an application or a data store;
Where necessary, the option will be documented with a logical data structure and a level 1 data-flow diagram. The users and analyst together choose a single business option. This may be one of the ones already defined or may be a synthesis of different aspects of the existing options.
N 2 diagram. In the example on the right, N equals 5. The five functions are on the diagonal. The arrows show the flow of data between functions. So if function 1 sends data to function 2, the data elements would be placed in the box to the right of function 1.