Creating NSV-4 Functional Decomposition diagrams for NAF 3
You can create NSV-4 data flow diagrams to view the flow of data among system functions and to view system functions in a hierarchical structure.
You can use this diagram as an alternative or in conjunction with the NSV-4 System Functionality Data Flow. This diagram is similar to a node tree or functional hierarchy diagram.
1 Click File > New Diagram.
2 In the Select New Type for All Methods dialog box, double-click one of the following diagram types:
▪NSV-4 System Functionality Data Flow
▪NSV-4 Functional Decomposition
3 In the New Diagram dialog box, type a name for the diagram; then click OK.
4 Draw the diagram.
The following symbols and relationships are used on the Systems Functionality Data Flow diagram:
System Function: Indicates a step in the flow of data
External: Represents an object that sends information or data to the system, or takes information from the system, but is not itself part of the system
System Data Exchange Line: Indicates the direction of the flow of data as it moves from one point in the system to another
Data Store: The location where data rests when it is neither flowing nor being operated on; a data store can be a database, hard disk or a file on a disk
5 To drag previously defined system functions into the diagram, right-click an empty space in the diagram; then click Choices.
6 To save the diagram, click File > Save Diagram.
Example
The following image shows an example of a Functional Decomposition diagram.
