Top SDLC Models Every Developer Should Know

What is SDLC?

SDLC (Software Development Life Cycle) is a step-by-step process used to develop high-quality software.

Phases of SDLC:

1. Requirement Gathering
2. Planning
3. Designing
4. Development
5. Testing
6. Implementation and Maintenance

What are SDLC Models?

SDLC Models are different approaches used to execute the SDLC phases.

Each model is chosen based on:

• Project size
• Requirements clarity
• Risk level
• Timeline

Types of SDLC Models
1. Waterfall Model
Definition:

A linear and sequential model where each phase is completed before moving to the next.

Advantages:

• Simple and easy to understand
• Well-structured
• Good for small projects

Disadvantages:

• No flexibility
• Difficult to handle changes

2. Agile Model
Definition:

An iterative and flexible model where development is done in small parts called sprints.

Advantages:

• Handles changing requirements
• Continuous feedback
• Faster delivery

Disadvantages:

• Requires experienced team
• Less documentation

3. V-Model (Validation & Verification)
Definition:

Each development phase has a corresponding testing phase.

Advantages:

• Early testing
• High quality

Disadvantages:

• Rigid structure
• Not flexible

Choosing the right SDLC model is important for project success.

• Use Waterfall when requirements are fixed
• Use Agile when requirements change frequently
• Use V-Model when testing is critical