The Architecture Design and Assessment System (ADAS) was a set of software programs offered by the Research Triangle Institute from the mid-1980s until the early 1990s.
Functional simulation of the model could be realized by attaching C or Ada code to the nodes.
The readiness for execution or firing of this process requires that: its inputs are satisfied, space is available for its outputs, and its shared resource/hardware is available.
During execution the node consumes its inputs, uses the resource for the prescribed duration, then produces its outputs.
Physical and behavioral properties were attached to nodes and arcs in the form of attributes.