Table of Contents
- 1 What are a sequence of steps which depict the interaction between the user and the application?
- 2 What is sequence diagram explain with example?
- 3 What are the elements of sequence diagram?
- 4 What is similarity between sequence & collaboration diagram?
- 5 What is the difference between sequence and activity diagram?
- 6 What is the relationship between sequence diagram and use cases?
- 7 What is asynchronous message in sequence diagram?
- 8 What is meant by sequence diagram?
- 9 What are the symbols used in sequence diagram?
- 10 Which diagram is used to show interactions between messages?
- 11 What is activity state in activity diagram?
- 12 What is purpose of activity diagram?
- 13 How loop is represented in activity diagram?
- 14 What is the use of system sequence diagram?
- 15 How do you show parallel process in activity diagram?
- 16 How do we represent guard condition in state diagram?
What are a sequence of steps which depict the interaction between the user and the application?
Scenario A scenario is a sequence of steps describing an interaction between a user and a system. Use case is a set of scenarios tied together by a common.
What is sequence diagram explain with example?
A sequence diagram shows object interactions arranged in time sequence. It depicts the objects involved in the scenario and the sequence of messages exchanged between the objects needed to carry out the functionality of the scenario. Sequence diagrams are sometimes called event diagrams or event scenarios.
How do you draw an interaction diagram?
How to Draw an Interaction Diagram?
- Objects taking part in the interaction.
- Message flows among the objects.
- The sequence in which the messages are flowing.
- Object organization.
How do you draw a collaboration diagram from a sequence diagram?
To create a collaboration diagram from a sequence diagram: Right-click in the background of the sequence diagram and select Create Default Collaboration Diagram in the contextual menu. Select Tools→Create Default Collaboration Diagram.
What are the elements of sequence diagram?
Basic Sequence Diagram Notations
- Class Roles or Participants. Class roles describe the way an object will behave in context.
- Activation or Execution Occurrence.
- Synchronous Message.
- Asynchronous Message.
- Reply or Return Message.
- Self Message.
What is similarity between sequence & collaboration diagram?
Similarities Between Sequence and Collaboration Diagram In Unified Modelling Language both the sequence diagram and collaboration diagram are used as interaction diagrams. Both the diagrams details about the behavioral aspects of the system.
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.
What are the two types of interaction diagram?
There are two types of interaction diagrams — sequence diagrams and collaboration diagrams. Each diagram is a graphical view of the scenario.
What is the difference between sequence and activity 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. Sequence diagram is mainly used to represent the time order of a process. Activity diagram is used to represent the execution of the process.
What is the relationship between sequence diagram and use cases?
A use-case model is built and the actors are connected to use cases. Each use case represents a task in which the actor participates. For each use case, a sequence diagram is built. Each sequence diagram specifies the main interaction steps to be achieved for each task (i.e. use case).
What are the major steps to develop a sequence diagram from an activity diagram?
How to Draw 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 does a message mean in sequence diagram?
Messages – Communication between objects is depicted using messages. The messages appear in a sequential order on the lifeline. We represent messages using arrows. Lifelines and messages form the core of a sequence diagram. Asynchronous Messages – An asynchronous message does not wait for a reply from the receiver.
What is asynchronous message in sequence diagram?
An asynchronous message is used when the message caller does not wait for the receiver to process the message and return before sending other messages to other objects within the system. The arrowhead used to show this type of message is a line arrow like shown in the example below.
What is meant by sequence diagram?
A sequence diagram is a type of interaction diagram because it describes how—and in what order—a group of objects works together. These diagrams are used by software developers and business professionals to understand requirements for a new system or to document an existing process.
What are different types of messages in sequence diagram?
A message in a UML sequence diagram specifies the kind of communication, and the sender and receiver. Messages can be named freely. Depending on the type of action the message represents, a message can be of the following sort: synchronous call, asynchronous call, asynchronous signal, or reply.
How do you show condition in a sequence diagram?
Selection and Loops in a Combination
- if -> (opt) [condition]
- if/else -> (alt) [condition], separated by horizontal dashed line.
- loop -> (loop) [condition or items to loop over]
What are the symbols used in sequence diagram?
Symbol and Components of a UML Sequence Diagram
- Lifeline: Lifelines in a UML Structure diagram are used to represent each instance in interaction.
- Object Flow:
- Initial State:
- Control Flow:
Which diagram is used to show interactions between messages?
Is used to show interactions between messages are classified as?
Collaboration diagrams (known as Communication Diagram in UML 2. x) are used to show how objects interact to perform the behavior of a particular use case, or a part of a use case.
Is state a diagram?
A state diagram is a type of diagram used in computer science and related fields to describe the behavior of systems. State diagrams require that the system described is composed of a finite number of states; sometimes, this is indeed the case, while at other times this is a reasonable abstraction.
What is activity state in activity diagram?
Action or Activity State – An activity represents execution of an action on objects or by objects. We represent an activity using a rectangle with rounded corners. Basically any action or event that takes place is represented using an activity.
What is purpose of activity diagram?
Creating Activity Diagrams Activity diagrams are an essential part of the modeling process. They are used to clarify complicated use cases, illustrate control among objects, or to show the logic of an algorithm.
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.
Does activity diagram contain action?
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. In both cases an activity diagram will have a beginning (an initial state) and an end (a final state).
How loop is represented in activity diagram?
There are 3 different notations that you can use.
- As your loop is based on some elements (folders, documents) the most convenient way is to use Expansion Region (of iterative type).
- Second option, that is a preferred choice when you have some guard based loop is a Loop Node.
What is the use of system sequence diagram?
Professionals, in developing a project, often use system sequence diagrams to illustrate how certain tasks are done between users and the system. These tasks may include repetitive, simple, or complex tasks. The purpose is to illustrate the use case in a visual format.
What is guard condition in activity diagram?
A guard condition is written within square brackets next to the flow. Control flows in exactly one direction from a decision node, and only follows a flow if the guard condition is true. The guard conditions associated with a decision node must be mutually exclusive, to avoid nondeterministic behavior.
How Guard condition is represented in sequence diagram?
In sequence diagrams, a guard condition, also called an interaction constraint, is a Boolean conditional expression that guards an interaction operand in a combined fragment. A guard condition contains two expressions that designate the minimum and maximum number of times that a loop combined fragment runs.
How do you show parallel process in activity diagram?
Paralleling Actions The ‘Fork’ element is used to show that actions execute in parallel. In the figure below, Action1 calls Action2 and Action3 in parallel. Using expansion regions we can show that sequence of actions (activity) may execute concurrently.
How do we represent guard condition in state diagram?
“Guard” is a condition which must be true in order for the trigger to cause the transition. “Effect” is an action which will be invoked directly on the object that owns the state machine as a result of the transition.