 Show What is an Activity Diagram?An activity diagram visually presents a series of actions or flow of control in a system similar to a flowchart or a data flow diagram. Activity diagrams are often used in business process modeling. They can also describe the steps in a use case diagram. Activities modeled can be sequential and concurrent. In both cases an activity diagram will have a beginning (an initial state) and an end (a final state). In between there are ways to depict activities, flows, decisions, guards, merge and time events and more. Learn about activity diagram symbols below: Basic Activity Diagram Notations and SymbolsInitial State or Start PointA small filled circle followed by an arrow represents the initial action state or the start point for any activity diagram. For activity diagram using swimlanes, make sure the start point is placed in the top left corner of the first column. Activity or Action StateAn action state represents the non-interruptible action of objects. You can draw an action state in SmartDraw using a rectangle with rounded corners. Action FlowAction flows, also called edges and paths, illustrate the transitions from one action state to another. They are usually drawn with an arrowed line. Object FlowObject flow refers to the creation and modification of objects by activities. An object flow arrow from an action to an object means that the action creates or influences the object. An object flow arrow from an object to an action indicates that the action state uses the object. Decisions and BranchingA diamond represents a decision with alternate paths. When an activity requires a decision prior to moving on to the next activity, add a diamond between the two activities. The outgoing alternates should be labeled with a condition or guard expression. You can also label one of the paths "else." GuardsIn UML, guards are a statement written next to a decision diamond that must be true before moving next to the next activity. These are not essential, but are useful when a specific answer, such as "Yes, three labels are printed," is needed before moving forward. SynchronizationA fork node is used to split a single incoming flow into multiple concurrent flows. It is represented as a straight, slightly thicker line in an activity diagram. A join node joins multiple concurrent flows back into a single outgoing flow. A fork and join mode used together are often referred to as synchronization. Time EventThis refers to an event that stops the flow for a time; an hourglass depicts it. Merge EventA merge event brings together multiple flows that are not concurrent. Sent and Received SignalsSignals represent how activities can be modified from outside the system. They usually appear in pairs of sent and received signals, because the state can't change until a response is received, much like synchronous messages in a sequence diagram. For example, an authorization of payment is needed before an order can be completed. Interrupting EdgeAn event, such as a cancellation, that interrupts the flow denoted with a lightning bolt. SwimlanesSwimlanes group related activities into one column. Final State or End PointAn arrow pointing to a filled circle nested inside another circle represents the final action state. Activity Diagram TutorialYou can make an activity diagram by connecting and joining various activity states. The starting point is usually marked with a dark, filled-in circle with an arrow pointing to the next state usually a rectangle with rounded corners. All action flows are represented with arrows indicating the transitions from state to state. SmartDraw makes drawing activity diagrams easy with built-in activity diagram templates that already have all the basic symbols docked and the tools to connect everything at your fingertips. What is decision point in an activity diagram?3.6.
A decision node is a node in an activity at which the flow branches into several optional flows. There is exactly one incoming edge and an arbitrary number of outgoing edges, which each have a condition. A merge node is a node in an activity at which several flows are merged into one single flow.
What type of diagram Activity diagram is?Activity diagram is basically a flowchart to represent the flow from one activity to another activity. The activity can be described as an operation of the system.
What is an activity diagram quizlet?Activity Diagram. a simple and intuitive illustration of what happens in a workflow, what activities can be done in parallel, and whether there are alternative paths through the workflow. Activity Diagrams depict. the sequence of activities.
What is the purpose of an activity diagram quizlet?Activity diagrams show the workflow from a start point to the finish point detailing the many decision paths that exist in the progression of events contained in the activity. They may be used to detail situations where parallel processing may occur in the execution of some activities.
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A decision point within an activity diagram may be shown with an activity symbol.
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