In incremental model the whole requirement is divided into various builds. Multiple development cycles take place here, making the life cycle a “multi-waterfall” cycle. Cycles are divided up into smaller, more easily managed modules. Incremental model is a type of software development model like V-model, Agile model etc.
In this model, each module passes through the requirements, design, implementation and testing phases. A working version of software is produced during the first module, so you have working software early on during the software life cycle. Each subsequent release of the module adds function to the previous release. The process continues till the complete system is achieved.
For example:
In the diagram above when we work incrementally we are adding piece by piece but expect that each piece is fully finished. Thus keep on adding the pieces until it’s complete. As in the image above a person has thought of the application.
Then he started building it and in the first iteration the first module of the application or product is totally ready and can be demoed to the customers.
Likewise in the second iteration the other module is ready and integrated with the first module. Similarly, in the third iteration the whole product is ready and integrated. Hence, the product got ready step by step.
Diagram of Incremental model:
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’d iteration.
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.
When to use the Incremental model:
- 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.
- A new technology is being used
- Resources with needed skill set are not available
- There are some high risk features and goals.
Some other models that you must read about:
Other popular articles:
- What is Iterative model- advantages, disadvantages and when to use it?
- What are Software Testing Levels?
- What is V-model- advantages, disadvantages and when to use it?
- What is Prototype model- advantages, disadvantages and when to use it?
- What is Spiral model- advantages, disadvantages and when to use it?
Muhammad yousaf says
it is really helpful, our mam is so strict and gives us scenarios to assign
good and suitable model to that scenarios, really helpful thank you
Bram says
1-Does Incremental model lifecylce is having only same duration of time box or variable duration time box. Lets say 1st Iteration is 2wk and 2nd Iteration is 3Wk.
2- Does Increament model lifecycle also pick up most important features first similar to Agile based life cyle ?
Mikael Zammit says
Some one know who and when it was invented?
mamoh says
very valuable thank you
Veronika Sheefeni says
Thank you very much and my God bless you. This was indeed helpful to me. Much appriciated.
uchitha says
thnx very important and valuable information
diego del angel says
excelent information.
joy chaulo says
very informative information. I like it.
Muhumuza Adam says
I can’t really understand coz as if the incremental model is the same as prototyping method. I can see they both have a prototype and an iterative process
sseko rovaghii says
hey you are good tutor,I love the way you are doing it to us,bravo man….continue giving us things like this. thank you
Seriki says
Sdlc was not explained very well to me in the school and now I want to know it better pls how can you help me
shivani rajendra bhadane says
helpful information……….thanx for your help
charles mulelu says
please assist me with books which has the incremental development life cycle . iam doing my project .i want to use it as my methodology.
pakalapati.Issac Paul Son says
extrodinary information…… tnx fr ur kind love towards students……good information keep it up…