Domain Object Modeling

5 minutes 5 Questions

Domain Object Modeling is a vital aspect of Feature Driven Development. In its essence, it represents an extensive and visual interpretation of the parts involved in building a system. This model is developed by a chief programmer, a domain expert, and other members who have deep insight into the p…

Guide: Domain Object Modeling in PMI-ACP / FDD

Domain Object Modeling is an important process used in Feature Driven Development (FDD) for the structure of a system using a collection of conceptual objects and services.

Why it is important: It provides a structured model that represents a system and its characteristics. This makes it easier to understand the system and its functionality; hence increasing the effectiveness of software development. It also promotes code reuse and facilitates team communication.

What it is: Domain Object Modeling is a practice in which developers create a model of the system using objects. This model includes objects that represent the entities in the business domain, their attributes, behaviors, relationships, and responsibilities.

How it works: In Domain Object Modeling, an object model is created to represent the system. This model is a pictorial representation of the structure and behavior of the system's objects. Developers detail the properties and operations of each object, as well as their interactions. The model aids in defining the business logic and analyzing how the system behaves.

Exam Tips: Answering Questions on Domain Object Modeling Understanding the concept of Domain Object Modeling is key to answering related questions effectively. Be sure to understand the characteristics of the Domain Object Model such as objects, properties, operations, and the interactions between these objects. Practice creating object models and ensure you clearly understand how to use them for different system scenarios.

Your approach should be to identify the major entities in the given scenario, model them as objects, and demonstrate their interactions. Know that every object has a state, behavior, identity; and objects communicate by sending and receiving messages.

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Question 1

A software development team is creating a web application for a hotel booking system. They need to model the relationship between rooms, reservations, and guests. Which of these approaches is best aligned with Domain Object Modeling best practices?

Use primitive data types to represent rooms, reservations, and guests Create a custom domain-specific language for defining the relationships Model rooms and guests only, ignoring reservations Create only a single Booking object to represent all three concepts Create separate Room, Reservation, and Guest objects with clearly defined relationships Design a separate Room and Reservation objects, but store guest information in the Reservation object

Correct Answer: Create separate Room, Reservation, and Guest objects with clearly defined relationships

Domain Object Modeling best practices recommend creating separate objects for each concept and establishing clear relationships between them. This approach enhances maintainability, scalability, and understanding of the system.

Question 2

During the development of an online shop, the team needs to model the concept of a User. However, they are debating whether to store the user's shipping address in the User object or a separate object. To maintain a clean Domain Object Model, what approach should they take?

Avoid storing shipping addresses at all Store the shipping address within the User object Create a separate Address object and link it with the User object Create multiple User objects for each shipping address Use a single global Address object for all Users Store the shipping address in a separate database without linking to the User object

Correct Answer: Create a separate Address object and link it with the User object

A clean Domain Object Model should promote separation of concerns and encapsulation. Creating a separate Address object and linking it with the User object allows for flexibility and scalability, without introducing unnecessary complexity or redundancy.

Question 3

In a project management software, the team decides to model the concepts of Project, Task, and Subtask. How should they design the domain model to follow best practices?

Create separate Project, Task, and Subtask objects with hierarchical relationships Create a single Project object, storing Tasks and Subtasks as nested lists Only create Project and Subtask objects, omitting the Task concept Separate domain objects into different databases without clear relationships Create separate Project and Task objects, but store Subtasks in the Task object Flat structure with all three concepts combined into one object

Correct Answer: Create separate Project, Task, and Subtask objects with hierarchical relationships

To maintain a clear and maintainable domain model, it's important to create separate objects for each concept and define proper relationships. In this case, a hierarchical relationship between Project, Task, and Subtask objects best represents their natural structure.

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