The incremental model is a software development method where the product is designed, implemented, and tested incrementally in builds until completion. Each module passes through requirements, design, implementation, and testing individually. Subsequent releases of modules add functionality to previous releases until the full system is achieved. The incremental model generates working software early and allows customer feedback at each build. It is also flexible, lowers initial costs, and easier to test and manage risks. However, it requires good upfront planning and design and has a higher total cost than waterfall. The incremental model is well-suited for web applications and when major requirements are defined but details may evolve.

1. Incremental
Model

2. Definition
● In incremental model the whole requirement is divided into various
builds.
● Each module (independent units) passes through the requirements,
design, implementation and testing phases.
● The incremental build model is a method of software development where
the product is designed,
● implemented and tested incrementally until the product is finished.

3. Definition
● Each subsequent(coming after something in time) release of the module
adds function to the previous release.
● The process continues till the complete system is achieved.

5. Advantages of Incremental model:
● Generates working software quickly and early during the software life
cycle.
● This model is more flexible, less costly to change scope and requirements.
● It is easier to test and debug during a smaller iteration.
● In this model customer can respond to each built.
● Lowers initial delivery cost.
● Easier to manage risk because risky pieces are identified and handled
during it’s iteration.

6. Disadvantages of Incremental model:
● Needs good planning and design.
● Needs a clear and complete definition of the whole system before it can
be broken down and built incrementally.
● Total cost is higher than waterfall.

7. When to use the Incremental model:
● Mostly such model is used in web applications and product based
companies.
● This model can be used when the requirements of the complete system
are clearly defined and understood.
● Major requirements must be defined; however, some details can evolve
with time.
● There is a need to get a product to the market early.

8. Incrementalvs Iterative Model
Incremental means:
● I write part one
● I write part two
● I write part three, until the
book is Finished!
Iterative means:
● I write loads of stuff that is a
complete mess,
● I go throwing out the
irrelevant, expanding on the
important bits, and sorting out
the structure
● I go through it again now I can
start to see the shape of it,
sorting it some more
● I go through it yet again, etc,
until it's GoodEnough!

9. Little bit of comparison (continued)
● Incremental
● Iteractive

10. Reference:
1) http://istqbexamcertification.com/what-is-incremental-model-advantages-di
sadvantages-and-when-to-use-it
2) https://www.guru99.com/what-is-incremental-model-in-sdlc-advantages-dis
advantages.html
3) https://www.testingexcellence.com/incremental-model/
4) https://www.quora.com/What-is-difference-between-iterative-model-increm
ental-model-and-agile-model
5) http://safetydave.net/wp-content/uploads/2014/07/Screen-Shot-2014-07-24
-at-9.43.34-pm.png
6) https://airbrake.io/blog/sdlc/iterative-model

11. Q and A
: >

12. Thank you!