When learning about Software Development Life Cycle (SDLC) models, two common terms are the Iterative Model and the Incremental Model. While they may sound similar, they have distinct differences in how software is built.
Iterative Model
The Iterative Model is like improving a rough draft over and over. You start with a basic version, then make it better step by step. Each step adds improvements, fixes problems, and refines features. For example, you might first create a simple login page, then make the design nicer, add error handling, and finally improve security. You keep repeating this process until the system is complete and meets all requirements.
Incremental Model
The Incremental Model involves building the software piece by piece. You divide the software into functional modules, called increments. Each increment is fully developed, tested, and delivered. The next increment adds more features to the existing product. For example, the first increment might include core login and registration features, the second increment adds user profile and settings, and the third increment includes notifications and messaging. Each increment is functional and usable on its own.
Key differences are:
Focus:
Iterative Model: Focuses on improving the same system repeatedly.
Incremental Model: Focuses on adding new features (increments) over time.
Approach:
Iterative Model: Build a rough version → Refine → Refine → Refine.
Incremental Model: Build module 1 → Build module 2 → Build module 3.
Testing:
Iterative Model: Testing happens after each refinement.
Incremental Model: Testing happens after each functional increment.
Delivery:
Iterative Model: Delivers improved versions of the same system.
Incremental Model: Delivers new functional modules each time.
In Simple Words:
Iterative: Rework and refine the same system in cycles.
Incremental: Add new features step by step