@ � � � � � � . This actor would add metadata about the templates and examples, including keywords for data types based on knowledge of what CMGP scientists call their data types. Here a diagram is given to show the flow of events that surrounds the use case. Use cases are about what the system should do, from the perspective of a user. e.g. In this Chapter, we’ll look at a sample Use Case template, and consider differ-ent methods for implementing that template. i j � � � * e kdo $$If �l � � ��R&. Thus, the extension use case turns out to be an inappropriate choice for modeling nonessential goal-related behavior; in contrast, the option flow is ideal for this. Below is a use case diagram template of a financial trading system. Use PDF export for high quality prints and SVG export for large sharp images or embed your diagrams anywhere with the Creately viewer. In our use case example, the alternate flow can be that the customer asks to be contacted over the phone. Another way to look at it is a use case describes a way in which a real-world actor interacts with the system. 3 Use Case Template #1. This section will call out examples of these resources. Writing use cases: The difference between Exceptions and Alternate Flows is actually very simple. a This use case diagram is a visual representation of the prose scenario shown above. Use cases are a set of actions, services, and functions that the system needs to perform. Alternative flows are usually the result of options or exceptions built into the use case which may alter the primary flow. Browse use case diagram templates and examples you can make with SmartDraw. � How long did it take? For Withdraw Cash Use Case - Customer inserts the bank card into the ATM machine.> Main Success Scenario