Domain Classes: Identifying and Defining

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Questions and Answers

Which of the following best illustrates the scope of the 'problem domain' in the context of systems analysis and design?

All possible technical challenges encountered during software development.
The specific area of the users’ business need that is within the scope of the new system. (correct)
The entirety of the IT department's responsibilities within an organization.
The complete software infrastructure required to run a business.

A company is developing a new inventory management system. Which of the following would MOST accurately be modeled as a domain class?

A user interface screen for entering new products.
An individual product with its attributes and behaviors. (correct)
The algorithm used to calculate reorder points.
A database table storing product information.

In the context of domain classes, what is the PRIMARY benefit of ensuring each class accurately represents a real-world concept or object?

It provides clarity about the key components of the system and how they relate to each other. (correct)
It simplifies the process of writing code by reducing the number of classes.
It automatically optimizes database performance.
It ensures compatibility with legacy systems.

Why is maintaining data integrity a crucial aspect of properly defining domain classes?

It ensures data consistency and reliability within the system. (B) Signup and view all the answers

How do domain classes primarily influence the design phase of a software development project?

By guiding the design of databases, user interfaces, and other system components. (B) Signup and view all the answers

Consider a library management system. Which of the following would be the MOST appropriate set of domain classes to model?

Books, Patrons, Loans, and Fines. (B) Signup and view all the answers

In a system designed for a university, which of the following options contains items that would ALL be viable candidates for domain classes?

Students, Courses, Grades, Instructors. (A) Signup and view all the answers

What is the main reason for modelling 'things' as domain classes?

To represent real-world entities, things, or concepts in a system. (B) Signup and view all the answers

What is the relationship between domain classes and data entities?

In some contexts, like a database class, domain classes may be referred to as data entities. (C) Signup and view all the answers

What could be considered NOT an importance of Domain Classes

Code Optimization (A) Signup and view all the answers

During the initial brainstorming phase for identifying domain classes, which action MOST effectively ensures a comprehensive coverage of potential 'things' within the system?

Starting with a predefined checklist of common entity types to prompt exploration of various categories. (B) Signup and view all the answers

A project team is using the noun technique to identify potential domain classes. After identifying an initial list of nouns, what is the MOST critical next step to refine this list?

Classifying each noun as either a domain class, an attribute, or something outside the system's scope. (C) Signup and view all the answers

When applying the noun technique, a team identifies 'customer address' as a potential domain class. Which question would BEST guide the decision of whether to include this as a separate class or an attribute of the 'Customer' class?

Does the system need to store multiple addresses for a single customer, or does the address have its own unique properties or behaviors? (A) Signup and view all the answers

In which scenario would the noun technique be MOST advantageous compared to brainstorming when identifying domain classes?

When there is limited access to users or stakeholders for direct collaboration. (D) Signup and view all the answers

During the refinement stage of the noun technique, a team identifies 'report' as a noun. Which question is MOST relevant to determine whether 'report' should be excluded from the list of potential domain classes?

Is the 'report' generated from other information already captured by the system? (A) Signup and view all the answers

In object-oriented programming, what is the significance of an object's attributes in relation to its class?

Attributes store information about the object, representing the properties or characteristics that the class 'knows' about the object. (A) Signup and view all the answers

A development team is modeling a library system. They've identified 'Book,' 'Author,' and 'Borrower' as potential domain classes. What is the MOST important consideration when defining the relationships between these classes?

Reflecting the real-world interactions and dependencies between these entities within the library system. (D) Signup and view all the answers

Consider a scenario where two distinct `Car` objects, `car1` and `car2`, are instantiated from the same `Car` class, what will be the difference?

<code>car1</code> and <code>car2</code> will have the same attributes but potentially different values for those attributes. (C) Signup and view all the answers

Within the context of a class representing a `Customer`, which of the following best exemplifies a compound attribute?

A detailed address including street number, city, and postal code. (A) Signup and view all the answers

Consider a scenario where 'Payment Method' is identified as a noun during system analysis. Which of the following questions would be MOST effective in determining whether it should be treated as a domain class or simply an attribute within another class such as 'Order'?

Is there a variety of payment methods (e.g., credit card, PayPal) each with its specific attributes and behaviors that the system needs to manage? (B) Signup and view all the answers

Which of the following represents the MOST significant challenge in applying the noun technique for domain class identification in a complex business system?

The potential for generating an extensive list of nouns, many of which may not represent relevant domain classes. (C) Signup and view all the answers

In a university course registration system, identify the most suitable candidate for an identifier attribute within the `Course` class.

A unique course code, ensuring no two courses have the same identifier. (A) Signup and view all the answers

In the provided `Car` class example, how might you modify the `start` method to conditionally initiate the car based on whether the fuel level, represented by the attribute `fuel_level`, is above a certain threshold?

By adding a conditional statement within the <code>start</code> method that checks the <code>fuel_level</code> attribute before initiating the car. (D) Signup and view all the answers

When deciding to include a noun as a domain class during system analysis, what is the primary rationale for ensuring that 'the system needs to remember more than one of these items'?

To indicate that the noun represents a collection of instances with distinct attributes and behaviors. (B) Signup and view all the answers

A team is using brainstorming and the noun technique. How can these methods be used together to build a better model?

Use both methods iteratively, using the results from one to refine the results of the other. (A) Signup and view all the answers

In the context of object-oriented design, why is it important to carefully choose attributes for a class?

Because the attributes define the data that each object of the class will hold, influencing its behavior and functionality. (D) Signup and view all the answers

Consider the university course registration system; how would you represent the relationship between a `Professor` and `Course` class, considering that a professor can teach multiple courses?

By creating a separate class, like <code>TeachingAssignment</code>, that links <code>Professor</code> and <code>Course</code> objects. (B) Signup and view all the answers

When designing a class, what is the primary reason for defining attributes as private (protected) and providing access through getter and setter methods?

To control access to the internal state of objects, ensuring data integrity and encapsulation. (B) Signup and view all the answers

Given a scenario where you need to add functionality to the `Car` class to include an advanced driver-assistance system (ADAS) without modifying the original class, which object-oriented principle would be most applicable?

Inheritance (B) Signup and view all the answers

In the context of the university course registration system, how can polymorphism be effectively utilized when dealing with different types of users (e.g., students, professors, administrators) accessing the system?

By defining a common interface or abstract class for all user types and implementing specific behaviors in their respective subclasses. (D) Signup and view all the answers

Flashcards

Domain Classes

Concepts or objects representing key items in a business process.

Problem Domain

Specific area of users’ business needs within a new system's scope.