![]() ![]() Sequence diagrams are interaction diagrams that illustrate the ordering of messages according to time. The control flow of organization using collaboration diagrams. The control flow by time ordering using sequence diagrams. Interaction diagrams are used for modeling − There are two types of interaction diagrams − They also include the messages passed between them. Interaction diagrams depict interactions of objects and their relationships. The system allows the manager to manage customer accounts and answer any queries posted by the customer. Once the customer places an order, it is processed by the sales department and the customer is given the bill. The trading house has transactions with two types of customers, individual customers and corporate customers. We assume the following features of the system − Let us consider an Automated Trading House System. To model the requirements of a system from the outside point of view. To model the context of a system by enclosing all the activities of a system within a rectangle and focusing on the actors outside the system by interacting with it. Relationships like dependency, generalization, and association.Use case diagrams present an outside view of the manner the elements in a system behave and how they can be used in the context. The following figure shows the notations of an actor named Student and a use case called Generate Performance Report. ![]() ActorĪn actor represents the roles that the users of the use cases play. Use cases may be applied to the whole system as well as a part of the system. It shows the interaction of things outside the system with the system itself. Use Case Model Use caseĪ use case describes the sequence of actions a system performs yielding visible results. The behavioral diagrams are categorized as follows: use case diagrams, interaction diagrams, state–chart diagrams, and activity diagrams. UML behavioral diagrams visualize, specify, construct, and document the dynamic aspects of a system.
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