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Incremental Model

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Yunnie Nazri

on 1 October 2013

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Transcript of Incremental Model

Project Management
Incremental Model

Presentation By:
Maurice Lee Changai

Nazatul Amierah Bte Norariffin

Hana Raihani Bte Hj Mat Salleh
Multi-waterfall cycles
+Incremental model is an intuitive approach to the waterfall model.
+Multi development cycles take places here, making the life cycles a "multi-waterfall" cycles.
+A working version of waterfall cycles software produce during the first iteration.
When to use this model?
Advantages
&
Disadvantages
Benefits
&
references
Incremental Model
Slide Contents:
Definition
Introduction
Examples
Multi-waterfall
When to use this model?
Advantages
Disadvantages

Advantages
Disadvantages
Incremental Testing in software
References
Conclusion
Question and Answer session
Definition
&
Introduction
Introduction
Definition
Incremental Model is a method of software development where the model is designed, implemented and tested incrementally until the product is finished.
+Modules passes through the requirement, design, implementation and testing phases.
+Working version of software produced during the first module - so you have working software life cycles.
+Subsequent release the module add function to previous release.
+Process continues till complete system is achieved.
+ Whole incremental model requirement divided into various builds.
+Multi development cycles take place, making life cycles a "Multi-Waterfall" cycle.
+Cycles divided up into smaller, easily managed modules.

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
examples of
multi-waterfall diagram
+Such model are used where requirement are clear.
+It delivered accordingly.
+Mostly such model used in webs applications and product based companies.
+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.
Advantages
+Generates working software quickly and early during the software life cycles.
+More flexible – less costly to change scope and requirement.
+Easier to test and debug during a smaller iteration
+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
+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.

Conclusion
The final conclusion for our presentation is that, incremental model is a development of system in a series partial product. It need a clear and complete design to make this incremental model to work, it is easy to manage risk because risky pieces are identified iterationaly. Incremental model is more cheaper than Multi-Waterfall.
Question And Answer Session
The End
and
Thank You for your Attention
Incremental Testing in Software
+Top Down: Testing takes place from top to bottom, following the control flow or architectural structure (e.g. starting from the GUI or main menu). Components or systems are substituted by stubs.

Bottom Up: testing takes place from the bottom of the control flow upwards. Components or systems are substituted by drivers.

+Functional incremental: Integration and testing takes place on the basis of the function and functionalities, as documented in the functional specifications.


+Another extreme that all programmers are integrated one by one, and a test is carried out after each step.

+The incremental approach has the advantage that the defects are found early in a smaller assembly when it is relatively easy to detect the cause.
+A disadvantage is that it can be time-consuming since stubs and drivers have to be developed and used in the test.

+Within incremental integration testing a range of possibilities exist, partly depending on the system architecture:

Benefits
Manager and developers who see working functionality early in the lifecycles.
Each increment is, effectively, a prototype for the next generation.

References
=Source:
http:// en.wikipedia.org/Incremental_build_model

http://en.wikipedia.org/wiki/Waterfall_model.html

http://qa.h2kinfosys/com/tag/waterfall-model.html

http://tanmayonrun.blogspot.com/2013/01/describe-incremental-model.html
Full transcript