1) What is Waterfall model?
The Waterfall Model is a traditional software development methodology that follows a linear, phase-by-phase approach, where each phase must be completed before moving to the next.
It does not allow backtracking and permits only minimal changes once a phase is completed.
Waterfall Model:
Phases of Waterfall Model
Requirement Analysis
All project requirements are gathered and documented at the beginning.
System Design
The system architecture and design are created based on requirements.
Development
Developers write code according to the design.
Testing
The completed system is tested to identify bugs and errors.
Deployment
The software is delivered to the client or released to users.
Maintenance
Fixing bugs and updating the system after deployment.
Advantages
Easy to manage due to structured phases
Works well for small projects
Clear requirements reduce confusion
Good for projects with fixed scope
Disadvantages
Not flexible (changes are difficult once the process starts)
Late testing may lead to higher risk
Not suitable for complex or long-term projects
Customer feedback is limited during development
When to Use
When requirements are clear and fixed
Small or simple projects
Projects with strict deadlines and budgets
2) What is V Model?
The V-Model is an extension of the Waterfall Model. It emphasizes testing at every stage of development, making it more structured and quality-focused.
The name “V-Model” comes from its shape, where the left side represents development phases and the right side represents testing phases.
V Model (Verification and Validation Model):
Verification → Are we building the product right?
Validation → Are we building the right product?
Structure of V-Model
Left Side (Development Phases)
Requirement Analysis
System Design
High-Level Design
Low-Level Design
Right Side (Testing Phases)
Unit Testing
Integration Testing
System Testing
Acceptance Testing
Each development phase has a corresponding testing phase.
Advantages
Early detection of defects
Strong focus on testing
Better quality product
Easy to manage and track progress
Disadvantages
Less flexible like Waterfall
Changes are hard to implement
Not suitable for dynamic or evolving requirements
Can be costly for large projects
When to Use
Projects with clearly defined requirements
Safety-critical systems (like healthcare, banking)
When high quality and testing are required
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