If a Use Case diagram is so high level, what's the benefit? Use Cases should deliver a goal for an actor, so they help us focus early on systems that are useful from the perspective of our users. A use case may not really achieve a goal, so again it should be merged. Two use cases might be similar enough to merge into one. A sequence in a scenario might deserve to be a use case in its own right. Sooner or later, you'll refine use cases and scenarios. And you can start to give them priorities, and start to map out scenarios. If you know the overall goal, you probably can intuitively identify a number of use cases, and you should write them down and build a first draft rough. Behind each ellipse there are a number of scenarios. The Use Case diagrams are a very high level summary. Gathering requirements can be as agile and iterative as building the code. You need process and notation, and UML is a tool for the second. You can also define your own primitive types in your model by using the primitive type element.I totally agree with others here - UML is not a process. Empty model with predefined primitive types" when creating a new model. To include this predefined set in your model, use the model template "2. They are located in the "Predefined types" container in the UML model. The primitive types are included in one of the available UML model templates. That way you do not need to define these specific primitive types yourself when modeling, you can use the predefined set. The UML functionality in Enterprise Studio offers a predefined set of commonly used primitive types. They can be included in UML class diagrams. In the UML language primitive types can be used to characterize attributes and operations. Other names for a state diagram are state machine diagram or state chart diagram.Įlements of a state diagram Predefined primitive types State diagrams can also be used to express the usage protocol of part of a system. Please note that you can add multiple sequence diagrams to your model by creating new ones, but it is not possible to copy a sequence diagram to create a new one.Įlements of a sequence diagram State diagramĪ state diagram is a behavior diagram that shows discrete behavior of a part of a designed system through finite state transitions. A sequence diagram shows different processes or objects that live simultaneously (shown in parallel vertical lifelines), and the messages exchanged between them in the order in which they occur (shown as horizontal arrows). It describes the interaction between objects in the sequential order that these interactions occur. Use cases are often refined into one or more sequence diagrams.Įlements of a use case diagram Sequence diagramĪ sequence diagram is an interaction diagram. Package diagrams are useful when class diagrams that encompass the whole system become too large.Įlements of a package diagram Use case diagramĪ use case diagram is a dynamic behavior diagram that describes a set of actions (use cases) that some system or systems should or can perform in collaboration with one or more external users of the system (actors). A package diagram is just a class diagram that shows only packages and dependencies. It shows the packages of classes that make up the model, and the dependencies between the packages. It describes the static structure of a system by imaging the classes of the system, their attributes, operations (or methods) and the relationships between the classes.Įlements of a class diagram Package diagramĪ package diagram is a static structure diagram.
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