Use case diagram questions and answers pdf

Again i repeat do not think you get an architecture position by reading interview questions. But yes there should be some kind of reference which will help you quickly revise what are the definition. Just by reading these answers you get to a position where you are aware of the fundamentals.

Use Case Diagrams FAQ

But if you have not really worked you will surely fail with scenario based questions. So use this as a quick revision rather than a shot cut. To give you a practical understanding i have put all the design patterns and UML in a video format and uploaded here. In my previous section we had concentrated on design patterns which is one of the most important fundamentals for architecture interviews.

In case you have missed it below are the link. One of the other areas other than design patterns which needs to be stronger for architects is putting appropriate UML diagrams in design document. Some of my previous articles i am sure you will love it.

Unified Modeling Language, a standard language for designing and documenting a system in an object-oriented manner. It has nine diagrams which can be used in design document to express design of software architecture. Use case diagram answers what system does from the user point of view. Use cases are mainly used in requirement document to depict clarity regarding a system.

There are three important parts in a use case scenario, actor and use case. Scenario: A scenario is a sequence of events which happen when a user interacts with the system. Use Case: Use case is task or the goal performed by the end user. Scenario represents an accountant entering accounts data in the system. Actors are further classified in to two types primary and secondary actors.

Primary actors are the users who are the active participants and they initiate the user case, while secondary actors are those who only passively participate in the use case. One is the use case diagrams and the other is a detail step table about how the use case works.

Use case diagrams are good to show relationship between use case and they also provide high over view. The table explanation of a use case talks details about the use case. So when a developer or a user is reading a requirement document, he can get an overview by looking at the diagram if he is interested he can read the use case tables for more details. The below use case represents a system which is used to maintain customer. When a customer is added successfully it should send an email to the admin saying that a new customer is added.

Only admin have rights to modify the customer. First lets define extend and include and then see how the same fits in this use case scenario.It is one of the diagram in UML for modeling the dynamic aspects of the system.

We can apply the UMl-use-case diagram to visualize the behavior of a system, subsystem or a class. In short we can define a use case diagram as, a diagram that shows a set of use cases and actors and their relationships. Generalization Association Dependency. A use-case specifies the behavior of a system when the human interacts with the system. It captures the various functionalities of the system what the system has to do without specifying how that behavior is implemented.

From this we can define the use-cases as follows. A Use-Case is a definition of a set of sequence of actions, including variants that a system performs to yield a result to the actor. Each sequence represents the intersection of the system with the things that exist outside the system.

Generally, an actor represents, o A role that a human play Customer, Librarian o A hardware component Printer ,Scanner o An another system A billing system o Any external system. Each use-case describes what a system or sub-system does but it does not specify how it does it.

For better understanding of the system functionalities, or use-cases we have to describe the flow of events for each use-case. Flow of events are used to specify the behavior of the use-cases. Through this flow of events, we an define - When the use-case starts and ends. The actor is connected to a set of use-cases to show the interaction between them. The only relationship between an actor and the use-case is Association. We can organize the usecases by specifying the relationships among them.

These relationships are specified in order to factor common behavior and also to factor variants. Generalization is a relationship in which a child usecase inherits he behavior and meaning of its parent use-case. The child may add to or override the behavior of its parents. Example Check Password Validate user Generalization. Retinal scan. Symbol: Generalization among usecase is rendered as a solid directed line with a large open arrowhead. An include relationship between usecases means that the base use explicitly incorporates the behavior case of another usecase.

The included usecase never stand alone. An include relationship is used to avoid describe some behavior in more than one usecase. An extend relationship means that base usecase implicitly incorporates the behavior of another usecase. The base usecase may stand alone, but under certain conditions, its behavior may be extended by the behavior of another usecase.

The base usecase may be extended only at certain points called Extension points. We can use the extend relationship to model the part of a usecase. The user may see to be optional, showing variation from the behavior. Refuse book Reserve Student Member Book. UseCase diagram is used to model the static view of the system.Here we have some frequently asked questions FAQ about or related to use case diagrams.

If you have some question not in the list or can provide a better answer, you can suggest those at the bottom of the page as a comment. Requirements describe external view of a system, system's externally observable characteristics phenotype. Older approach to requirements is to describe what a system should do without specifying how it does it.

There are different methods of requirements elicitation. To collect requirements: recognize the problem being experienced, or determine the opportunities to better serve customers, ascertain external system behavior that could address those problems or opportunities, document the list of the problems, opportunities, and desired behaviors as requirements.

Some types of requirements are: Functional requirements - what the system should do. Quality or non-functional requirements - how fast, reliable, secure system should be.

Data requirements - what data should be stored by system. Functional requirements describe what the system should do in terms of system's input, system's behavior in response to that input, and output back to the user of the system.

Are use cases the same as functional requirements or functional requirements are different from use cases? Functional requirements could be collected and documented using different approaches, techniques, tools, and templates. Use cases were created by Ivar Jacobson in to support visual modeling of functional requirements. Use cases became one of the most widely used approaches for capturing functional requirements for object-oriented systems as part of UML and Rational Unified Process RUP.

It is now a common practice to express functional requirements as use cases, described in both graphical and narrative form. Use case diagram is UML diagram which shows some business or software system, its external users called actorsand a set of actions called use cases that users of the system should or can perform while using the system.

Use case diagrams are used to describe functionality of a system from the point of view of external users. Each use case describes a unit of complete and useful functionality that business or system provides to its users, how external user interacts with a system to achieve a desired result.

Some examples of use cases: Hire employee, Buy ticket, Place order, Deposit funds. Actor represents some group called "role" of external customers or users of the business or software system.

Actors have some needs and require specific services from the system. Some examples of actors are: Customer, Student, and Passenger. Actor could be not just human but also another system, business, or device.

Use case diagram shows business or system, its external users, and use cases applicable to the system.To model a system, the most important aspect is to capture the dynamic behavior. Only static behavior is not sufficient to model a system rather dynamic behavior is more important than static behavior.

In UML, there are five diagrams available to model the dynamic nature and use case diagram is one of them. Now as we have to discuss that the use case diagram is dynamic in nature, there should be some internal or external factors for making the interaction. These internal and external agents are known as actors. Use case diagrams consists of actors, use cases and their relationships.

A single use case diagram captures a particular functionality of a system. The purpose of use case diagram is to capture the dynamic aspect of a system. However, this definition is too generic to describe the purpose, as other four diagrams activity, sequence, collaboration, and Statechart also have the same purpose. We will look into some specific purpose, which will distinguish it from other four diagrams.

Use case diagrams are used to gather the requirements of a system including internal and external influences. These requirements are mostly design requirements. Hence, when a system is analyzed to gather its functionalities, use cases are prepared and actors are identified. Use case diagrams are considered for high level requirement analysis of a system.

UML Class Diagram Tutorial with Examples

When the requirements of a system are analyzed, the functionalities are captured in use cases. We can say that use cases are nothing but the system functionalities written in an organized manner.

The second thing which is relevant to use cases are the actors. Actors can be defined as something that interacts with the system.

Object Oriented Analysis and Design Questions & Answers | OOAD | MCQ

Actors can be a human user, some internal applications, or may be some external applications. When we are planning to draw a use case diagram, we should have the following items identified. Use case diagrams are drawn to capture the functional requirements of a system. After identifying the above items, we have to use the following guidelines to draw an efficient use case diagram.

The name of a use case is very important.

use case diagram questions and answers pdf

The name should be chosen in such a way so that it can identify the functionalities performed. Do not try to include all types of relationships, as the main purpose of the diagram is to identify the requirements.

use case diagram questions and answers pdf

Following is a sample use case diagram representing the order management system. Hence, if we look into the diagram then we will find three use cases Order, SpecialOrder, and NormalOrder and one actor which is the customer. Hence, they have extended relationship. Another important point is to identify the system boundary, which is shown in the picture.

The actor Customer lies outside the system as it is an external user of the system. As we have already discussed there are five diagrams in UML to model the dynamic view of a system.The standard is managed, and was created by, the Object Management Group. UML Interview Questions and Answers will discus that UML includes a set of graphical notation techniques to create visual models of software-intensive systems.

Is This Answer Correct? Structural, behavioral, architectural. Takes care structural and behavioral aspect of a software system. Includes software usage, functionality, performance, reuse, economic and technology constraints. Specification of a communication. This Life cycle is divided into phases. Supporting Workflows are configuration, change management, and project management.

We have nine types of diagram in UML. It identifies the primary elements and processes that form the system. The class diagram is designed using Use Case diagram. Object diagram This diagram represents the state of classes in the system and their relationships or associations at a specific point of time.

State Diagram This diagram represents different states that objects in the system undergo during their life cycle. Sequence diagram This diagram is used to explore logic of complex operations, function or procedure.

In this diagram, sequence of the interactions between the objects is represented step by step. Collaboration diagram This diagram groups together the interaction between different objects. Activity diagram Activity diagram gives detail view of the business logic. Deployment diagram It shows deployment view of the system. It shows how hardware and software works together to run system. Advantages of using UML breaks the complex system into discrete pieces that can be understood easily.

Handover the system to new team becomes easier. Complex system can be understood by the disparate developers who are working on different platforms. UML model is not a system or platform specific. It unifies all disparate developers under one roof. A component diagram is particularly useful with teams of larger size.

UML components are great to perform architectural landscape for a specific system. The component diagram allows to model high level software components and interfaces to those components.A Class is a blueprint that is used to create Object. The Class defines what object can do. What is Class Diagram? This Diagram includes the class name, attributes, and operation in separate designated compartments.

use case diagram questions and answers pdf

Class Diagram defines the types of objects in the system and the different types of relationships that exist among them.

It gives a high-level view of an application. This modeling method can run with almost all Object-Oriented Methods. A class can refer to another class. A class can have its objects or may inherit from other classes. Class Diagram helps construct the code for the software application development. In this tutorial, you will learn: What is Class? This can easily reduce the maintenance time It helps for better understanding of general schematics of an application.

Allows drawing detailed charts which highlights code required to be programmed Helpful for developers and other stakeholders. It appears in the topmost compartment. The class is rendered as a rectangle, including its name, attributes, and operations in sperate compartments.

Following rules must be taken care of while representing a class: A class name should always start with a capital letter. A class name should always be in the center of the first compartment. A class name should always be written in bold format. An abstract class name should be written in italics format. Attributes: An attribute is named property of a class which describes the object being modeled.

In the class diagram, this component is placed just below the name-compartment. A derived attribute is computed from other attributes. Attributes characteristics The attributes are generally written along with the visibility factor. Visibility describes the accessibility of an attribute of a class. Attributes must have a meaningful name that describes the use of it in a class. Relationships There are mainly three kinds of relationships in UML: Dependencies Generalizations Associations Dependency A dependency means the relation between two or more classes in which a change in one may force changes in the other.

However, it will always create a weaker relationship. Dependency indicates that one class depends on another. In the following example, Student has a dependency on College Generalization: A generalization helps to connect a subclass to its superclass.Airport check-in and security screening business model. Restaurant business model. Ticket vending machine. Point of Sales POS terminal. Online shopping use case diagrams. Credit card processing system. Website administration. Hospital Management.

Radiology diagnostic reporting UML use case diagram example. Software protection and licensing UML use case diagram example. Abstract Factory Design Pattern. Library domain model. Bank account class diagram example. Online shopping domain model. Health insurance policy UML class diagram example.

UML Use Case Diagram Tutorial

Hospital domain UML class diagram example. Java util. Android Camera implementation classes. Web application Login Controller object diagram.

Apache Tomcat 7 web server UML composite structure diagram example. Observer design pattern as UML collaboration use example. Multi-Layered Application Model. Multi-Layered Web Architecture. Java Servlet 2. Java Servlet 3. Spring and Hibernate ORM data access packages and classes. Data Transfer Object Value Object design pattern package template. Online shopping component diagram. Sentinel HASP licensing components.

use case diagram questions and answers pdf

Online shopping web application manifestation. Online shopping web application UML deployment diagram. Clustered deployment of J2EE web application. Multilayered load balancing of J2EE servers.

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