7.4 Modeling Flows
An important aspect of system specification is defining the flows that occur between different parts of a system. Flows may be physical in nature, for example a water pump might specify that water can flow in and out of the pump, and that electrical power can flow in. Often, in electronic systems, it is information and/or control that flow, such as a signal that a radar system has detected a target, or that a button has been pressed on a keyboard.
The general term item is used to define things that flow. Blocks may contain special properties, called flow properties, which define the items that can flow into or out of that block. In addition, item flows specify what actually does flow on connectors between parts.
7.4.1 Modeling ...
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