IB Computer Science Topic D.1.3 Decomposition of a Problem Revision Notes (SL/HL)

IB Computer Science Topic D.1.3 Decomposition of a Problem Revision Notes (SL/HL) | RevisionDojo

Understanding Decomposition

Definition

Decomposition

The process of breaking down a complex problem into smaller, more manageable parts.

In OOP, this involves identifying objects and their relationships to model a system effectively.

Analogy

Think of decomposition like assembling a puzzle.
Each piece (object) fits into a larger picture (the system), and understanding each piece helps you solve the entire puzzle.

Example

Some of real-world examples:

Calendar application:
1. Objects: Calendar, Year, Month, Day, Event
2. Relationships: A Calendar contains multiple Years, each Year has Months, and so on.
Music player:
1. Objects: Track, Playlist, Player, User
2. Relationships: A Playlist contains multiple Tracks, and a User interacts with the Player that plays a Track.

Now, let's see how we can decompose more complex systems.

Example scenario: Delivery System

Let's explore how to decompose a delivery system into objects.

Identify the main entities:

Package: Represents the item being delivered.
DeliveryPerson: Responsible for transporting the package.

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Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit.

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

Unlock the rest of this chapter with a free account

Understanding Decomposition

Definition

Decomposition

The process of breaking down a complex problem into smaller, more manageable parts.

In OOP, this involves identifying objects and their relationships to model a system effectively.

Analogy

Think of decomposition like assembling a puzzle.
Each piece (object) fits into a larger picture (the system), and understanding each piece helps you solve the entire puzzle.

Example

Some of real-world examples:

Calendar application:
1. Objects: Calendar, Year, Month, Day, Event
2. Relationships: A Calendar contains multiple Years, each Year has Months, and so on.
Music player:
1. Objects: Track, Playlist, Player, User
2. Relationships: A Playlist contains multiple Tracks, and a User interacts with the Player that plays a Track.

Now, let's see how we can decompose more complex systems.

Example scenario: Delivery System

Let's explore how to decompose a delivery system into objects.

Identify the main entities:

Package: Represents the item being delivered.
DeliveryPerson: Responsible for transporting the package.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

1. System fundamentals2 subtopics

2. Computer organization1 subtopic

3. Networks1 subtopic

4. Computational thinking, problem-solving and programming3 subtopics

5. Abstract data structures (HL)1 subtopic

6. Resource management (HL)1 subtopic

7. Control (HL)1 subtopic

A. Databases4 subtopics

B. Modelling and simulation4 subtopics

C. Web science6 subtopics

D. Object-oriented programming (OOP)4 subtopics

IB Computer Science D.1.3 Decomposition of a Problem Notes

1. System fundamentals2 subtopics

2. Computer organization1 subtopic

3. Networks1 subtopic

4. Computational thinking, problem-solving and programming3 subtopics

5. Abstract data structures (HL)1 subtopic

6. Resource management (HL)1 subtopic

7. Control (HL)1 subtopic

A. Databases4 subtopics

B. Modelling and simulation4 subtopics

C. Web science6 subtopics

D. Object-oriented programming (OOP)4 subtopics

Understanding Decomposition

Example scenario: Delivery System

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Understanding Decomposition

Example scenario: Delivery System

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account