![]() ![]() It is time-ordered, indicating that the exact interactions between objects are displayed step by step. Without any doubt, this is the main difference between the activity diagram and sequence diagram.Ī sequence diagram depicts the flow of data from one object to another by showing the picture representation of the data. On the other hand, the sequence diagram displays object interactions arranged in a time sequence. The activity diagram is a graphical representation of a workflow of related stepwise activities and actions, supporting choice, iteration, and concurrency. Here are some significant differences between the activity diagram and sequence diagram. What is the Importance of an Activity Diagram?Īn activity diagram helps programmers understand the flow of programs on a high level and identify constraints and circumstances that cause certain events.Ī flow chart becomes an activity diagram if complex decisions have to be made. Within the activity diagram, sequential and peripheral workflows are characterized by control and object flows. Activity Diagram DefinitionĪn activity diagram represents business and software processes as a progression of actions performed by people, components, or computers.Īctivity diagrams are used to explain business processes and use cases, as well as to describe and document the implementation of system processes.Īctivity diagrams represent sequential, multi-step work processes, and they enable the visualization of even the most complex workflows. Sequence diagrams are so useful because they demonstrate the interaction logic between objects in the system in the order in which they occur. Software developers use sequence UML diagrams to document a system’s requirements and design in detail. What is the Importance of a Sequence Diagram? For this reason, sequence diagrams are occasionally called event diagrams or event scenarios. These templates are often used by software developers and business professionals to document an existing process, and they describe how a group of objects works together. Sequence diagrams are interaction diagrams that show how a set of objects interacts with one another and in what order. Sequences & Activity Diagram DifferencesĪ sequence diagram is a subset of an interaction diagram which is a class of template created in UML.What is the Importance of an Activity Diagram?.What is the Importance of a Sequence Diagram?.In the edit field below the list box, enter the constraint expression for this action. The possible options are OCL and plain text. ![]() In the Local Precondition and Local Postcondition tabs, select the language of the constraint expression from the Language list box.In the Properties, View, Description, and Custom tabs, configure standard properties of the element.Use the Object Inspector to adjust action properties, including: Using decisions and merges, you can manage multiple outgoing and incoming control flows. Note that the flow final may not have any outgoing links. The flow final node means that a certain flow within an activity is complete. Data and control flows are different in UML 2.0.Ī control flow may have multiple sources (it joins several concurrent actions) or it may have multiple targets (it forks into several concurrent actions).Įach flow within an activity can have its own termination, which is denoted by a flow final node. By flow, we mean that the execution of one node affects and is affected by the execution of other nodes, and such dependencies are represented by edges in the activity diagram. The semantics of activities is based on token flow. The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise. An action is an executable activity node that is the fundamental unit of executable functionality in an activity, as opposed to control and data flow among actions. An activity represents a behavior which is composed of individual elements that are actions. An action represents a single step within an activity, that is, one that is not further decomposed within the activity. Actions are not states (compared to UML 1.x) and can have subactions. In UML 2.0, activities consist of actions. If an action can be broken into a sequence of other actions, you can create an activity to represent them. Actions are the basic units of the system behavior.Īn Activity diagram enables you to group and ungroup actions. The activity diagram enables you to model the system behavior, including the sequence and conditions of execution of the actions. Go Up to UML 2.0 Activity Diagrams Definition ![]()
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