Coupling and cohesion in Software Engineering - Mini Project: Build & Apply

Understanding Coupling and Cohesion

📖 Scenario: You are part of a software development team designing a simple library management system. To keep the system easy to maintain and understand, you need to organize the code into parts that are well connected internally but loosely connected to each other.

🎯 Goal: Build a simple example that shows how to organize code with high cohesion and low coupling by defining modules and their interactions.

📋 What You'll Learn

Create a dictionary representing modules and their responsibilities

Add a variable to represent the coupling level between modules

Write a loop to identify modules with high cohesion

Add a final summary statement about the system's design quality

💡 Why This Matters

🌍 Real World

Software developers organize code into modules that work well internally (high cohesion) but depend little on others (low coupling) to make programs easier to maintain and update.

💼 Career

Understanding coupling and cohesion helps software engineers design clean, modular systems that reduce bugs and simplify teamwork.

1

Create the modules dictionary

Create a dictionary called modules with these exact entries: 'UserManagement': 'Handles user registration and login', 'BookCatalog': 'Manages book listings and details', 'LoanProcessing': 'Processes book loans and returns', 'Notification': 'Sends alerts and reminders'.

Software Engineering

# Your code here

Hint

Use a dictionary with module names as keys and their responsibilities as values.

2

Add coupling level variable

Add a variable called coupling_level and set it to the string 'Low' to represent the desired low coupling between modules.

Software Engineering

modules = {
    'UserManagement': 'Handles user registration and login',
    'BookCatalog': 'Manages book listings and details',
    'LoanProcessing': 'Processes book loans and returns',
    'Notification': 'Sends alerts and reminders'
}
# Your code here

Hint

Set a simple string variable to show coupling is low.

3

Identify highly cohesive modules

Write a for loop using variables module and responsibility to iterate over modules.items(). Inside the loop, create a condition that checks if the word 'Handles' is in responsibility. If true, add the module name to a list called high_cohesion_modules. Initialize high_cohesion_modules as an empty list before the loop.

Software Engineering

modules = {
    'UserManagement': 'Handles user registration and login',
    'BookCatalog': 'Manages book listings and details',
    'LoanProcessing': 'Processes book loans and returns',
    'Notification': 'Sends alerts and reminders'
}
coupling_level = 'Low'

# Create list and loop to find modules with 'Handles' in responsibility
# Your code here

Hint

Use a list to collect module names and check the string 'Handles' in each responsibility.

4

Add final design summary

Add a variable called design_summary and set it to the string 'System has high cohesion and low coupling for easier maintenance.' to summarize the design quality.

Software Engineering

modules = {
    'UserManagement': 'Handles user registration and login',
    'BookCatalog': 'Manages book listings and details',
    'LoanProcessing': 'Processes book loans and returns',
    'Notification': 'Sends alerts and reminders'
}
coupling_level = 'Low'

high_cohesion_modules = []
for module, responsibility in modules.items():
    if 'Handles' in responsibility:
        high_cohesion_modules.append(module)

# Your code here

Hint

Summarize the design in a simple string variable.