Gane-Sarson diagrams show the storage, exchange, and alteration of data and resources
throughout the diagram, which is a capability that many other diagrams do not possess.
In most Gane-Sarson diagrams, the information released at the end of the process is
different from the information received at the beginning of the diagram.
Gane-Sarson diagrams should be used any time resources or information are being moved
or changed throughout the course of a process. These diagrams are made especially for
this and can show data movement in a relatively simplistic manner.
- Start the diagram. Gane-Sarson diagrams always begin with an outside entity. This is represented by a square and should be placed at the top or right hand side of the paper to signify a starting point. You may choose to label what the outside entity is.
- Make connections. Use lines with arrowheads on the end to indicate the direction and path of the information. Each symbol must be linked with at least one arrow.
- Add to the diagram. Throughout the course of the diagram there should be processes, represented by rectangles. Each rectangle must be labeled with the title of the process it represents so that the diagram is clear.
- Data storage. An open-ended rectangle represents data storage. The right side is left open while a number is placed on the left side. This number helps to identify between data storage and keeps things organized.
- Finish the diagram. At the end of the diagram add another square or outside entity. Once the system is concluded the resources or information is released in its new, altered state.
- Verify accuracy. Consult with coworkers or team members to ensure that the diagram is accurate.