Systems and interfaces are of a specific type which is expressed by respective symbol variants.
To increase visual expressiveness any allusive image can be used instead of a system symbol. In this case the type information must be conveyed by other conventions – if needed for clarity, machine interpretation or systematic analysis.
The following sections describe the basic, standardized symbols.
Minimal Set Of Elements
- Systems are drawn as named ellipses.
- Flows are drawn as named unidirectional arrows.
- Interfaces are drawn as small named symbols.
- External Systems are drawn as rectangles.
- Actors are drawn as stick figures. They are a variant of external systems.
- Storages are drawn as two parallel horizontal lines
Information interfaces are drawn as circles.
Energy in/outlets are drawn as symbolized flashes.
Matter in/outlets are drawn as squares.
System in/outlets are drawn as semicircles.
Action handles are drawn as open rectangles.
- Collectors bundle or fan out Flows and are drawn as medium sized circles.
- Notes are drawn as rectangles with the upper right corner folded and contain comment text.
- Associations are drawn as dashed lines. They connect notes to other symbols.