Iterative model
What is Incremental Model?
Incremental Model is a process of software development where requirements are broken down into multiple standalone modules of the software development cycle. Incremental development is done in steps from analysis design, implementation, testing/verification, maintenance.

Each iteration passes through the requirements, design, coding and testing phases. And each subsequent release of the system adds function to the previous release until all designed functionality has been implemented.
The system is put into production when the first increment is delivered. The first increment is often a core product where the basic requirements are addressed, and supplementary features are added in the next increments. Once the core product is analyzed by the client, there is plan development for the next increment.
Characteristics of an Incremental module includes:
System development is broken down into many mini development projects
Partial systems are successively built to produce a final total system
the highest priority requirement is tackled first
Once the requirement is developed, requirements for that increment are frozen
Incremental Phases
Requirement Analysis - requirement and specification of the software are collected
Design - some high-end function are designed during this stage
Code - coding of software is done during this stage
Test - once the system is deployed, it goes through the testing phase
When to use Incremental models?
Requirements of the system are clearly understood
When demand for an early release of a product arises
When software engineering team are not very well skilled or trained
When high-risk features and goals are involved
Such methodology is more in use for web application and product-based companies
Advantages and Disadvantages of Incremental Model
Advantages
Disadvantages
The software will be generated quickly during the software life cycle
It requires a good planning designing
It is flexible and less expensive to change requirements and scope
Problems might cause due by system architecture as such not all requirements collected upfront for the entire software lifecycle
Throughout the development, stages changes can be done
Each iteration phase is rigid and does not overlap each other
This model is less costly compared to others
Rectifying a problem in one unit requires correction in all the units and consumes a lot of time
A customer can respond to each building
Errors are easy to be identified
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