Activity and sequence diagrams are two behavior diagrams. The main difference between activity diagram and sequence diagram is that
the activity diagram represents the flow of activities in a system
while the sequence diagram represents the sequence of messages flowing from one object to another.
What is meant by activity diagram?
An activity diagram is a behavioral diagram i.e.
it depicts the behavior of a system
. An activity diagram portrays the control flow from a start point to a finish point showing the various decision paths that exist while the activity is being executed.
What is activity diagram and sequence diagram?
The Activity diagram represents the UML, which is used to model the workflow of a system. The Sequence diagram
shows the message flow from one object to another object
. The Activity diagram shows the message flow from one activity to another. … Sequence diagram is mainly used to represent the time order of a process.
What is activity diagram explain with example?
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.
What is the purpose of activity diagram?
An activity diagram shows
business and software processes as a progression of actions
. These actions can be carried out by people, software components or computers. Activity diagrams are used to describe business processes and use cases as well as to document the implementation of system processes.
What are the elements of activity diagram?
- Action: A step in the activity wherein the users or software perform a given task. …
- Decision node: A conditional branch in the flow that is represented by a diamond. …
- Control flows: Another name for the connectors that show the flow between steps in the diagram.
What are the 9 UML diagrams?
- Class Diagram. Class diagrams are the most common diagrams used in UML. …
- Object Diagram. Object diagrams can be described as an instance of class diagram. …
- Component Diagram. …
- Deployment Diagram. …
- Use Case Diagram. …
- Sequence Diagram. …
- Collaboration Diagram. …
- Statechart Diagram.
What is the use of system sequence diagram?
Sequence diagrams are used to
express interactions of external elements with the system realizing a use case, interesting specific interactions among elements within the system design
, or specify test cases using the UML Testing Profile [2].
What is the difference between activity and state diagram?
Both activity and state chart diagrams model the dynamic behavior of the system. Activity diagram is essentially a flowchart showing
flow of control from activity to activity
. A state chart diagram shows a state machine emphasizing the flow of control from state to state.
What is use case and activity diagram?
An activity diagram in the use-case model
illustrates the flow of events of a use case
. The flow of events of a use case describes what needs to be done by the system to provide value to an actor. … Such a diagram shows: Activity states, which represent the performance of an activity or step within the flow of events.
What is class diagram example?
Class diagrams are the main building block in object-oriented modeling. … In the example, a class
called “loan account” is depicted
. Classes in class diagrams are represented by boxes that are partitioned into three: The top partition contains the name of the class.
How do you create an activity diagram?
- Step 1: Figure out the action steps from the use case. Here you need to identify the various activities and actions your business process or system is made up of.
- Step 2: Identify the actors who are involved. …
- Step 3: Find a flow among the activities. …
- Step 4: Add swimlanes.
What are the objectives of sequence diagram?
The diagram’s purpose
The sequence diagram is used
primarily to show the interactions between objects in the sequential order that those interactions occur
. Much like the class diagram, developers typically think sequence diagrams were meant exclusively for them.
What are the advantages of sequence diagram?
Benefits of sequence diagrams
Represent the details of a UML use case
. Model the logic of a sophisticated procedure, function, or operation. See how objects and components interact with each other to complete a process. Plan and understand the detailed functionality of an existing or future scenario.
What are Swimlanes in activity diagram?
Swimlane is
a way in which the performed activities can be grouped by the same actor on an Activity diagram
. To use swimlanes in an activity diagram, we need to arrange the activity diagram into vertical zones that are separated by the lines. … On the other hand, Swimlane is not a part of the term UML.
How loop is represented in activity diagram?
The loop symbol has an appropriate representation in a construction consisting of
four UML activity symbols – TASK, DECISION and two edges
, where one edge leads from the TASK to DECISION and the other one leads backwards. The TASK represents the action and the decision node is used to resolve the loop condition.
