![]() ![]() If you are omitting the name, the colon in front of the type remains. Therefore, you should show the name of the parameter or attribute in the head of the lifeline, e.g. One final recommendation: Lifelines can represent attributes or parameters. ![]() I would rather use messages from the frame of the diagram, because in principle you know, where they come from, you just choose not to model it. A generalized actor in an use case diagram Extend Relationship Between Two Use Cases Many people confuse the extend relationship in use cases. You are using found messages for the messages coming from the user. Reply messages must return to the lifeline, that sent the synchroneous message, because "synchroneous" means that the sender is waiting for the reply. One mistake in the diagram is, that your reply messages are not consistent with the synchroneous messages. When you send a buy-message to a Ticket object, what is it supposed to do with another Ticket object? In Use Case Diagram, you can use following elements. Drag lines from the actors to the use cases by pulling out a line from the red dots that. For instance, if your check-in app does not support taking photos, but its on the agenda for a future release, put it outside the system. Select Model Add Diagram Use Case Diagram in Menu Bar or select Add Diagram Use Case Diagram in Context Menu. Place each use case in the system that supports it, and draw use cases not supported by your system outside the box. It is also strange, that Ticket.buy expects a parameter of type Ticket. Raw Blame Working with Use Case Diagram To create a Use Case Diagram: Select first an element where a new Use Case Diagram to be contained as a child. The usage is: if the actor is on the left, it means that's a 'primary actor', the actor who activates the use case. Please see image extracted from the norm. However, this would only be visible in a sequence diagram, when the implementation leads to different messages being sent. This is an association, in the norm, association between actor and use has no direction. I understand, that you want to express, that the implementation of getCost depends on the type of ticket. Therefore, the four Ticket lifelines should be only one and all the getCost-messages would be directed to the same lifeline that sends them. Then, why is a Ticket object communicating with a Single Use Ticket object? That would only make sense, if Ticket had an association to Single Use Ticket, which it hasn't. The next thing is, that a Ticket generalizes Single Use Ticket, so each object of type Single Use Ticket is also a Ticket. It doesn't have such an attribute, but we could interpret this as the result of some TypeOf()-function. Typically the guard will use some attribute of the type represented by the lifeline with the first message in the operand, Ticket in this case. If it is a guard, then it needs to be in square brackets. Actor is shown in the form of stick man or rectangle with icon, that is decoration view. However, some things are unclear: In your operands you have a text (e.g."Single Use"). In order to create Actor, click Toolbox -> UseCase -> Actor button and click the position where to place Actor. You are already using the correct element for this: A combined fragment with alt-operator. ![]()
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