A flow model is a flow rule which is marked in Visio as Draft mode (). Even when the availability of the flow rule is set to Yes, a flow model may contain references to activities, properties, and other rules that do not yet exist or are not available.
You also can test a flow model interactively, though much of the full flow capability is not yet available. When you test a flow, interactive links display on forms with missing rules and flow actions allowing you to create them on the fly without exiting the flow. 5.5 GRP-479
For more information about flow modeling, see Pega Developer Network article PRKB-25166 How to create and test a flow model.5.5 GRP-479
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Flow rules
Flow rules — Visio editing basics |