spiral model of sdlc
TRANSCRIPT
SPIRAL MODEL of SDLC
HELLO! We are,
Animesh ChakrabortyAbdullah Al Omar
Albub Yusuf
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Overview
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1. Definition.2. Conceptual view.3. Brief History.4. Phases.5. Structure.6. Application.7. Pros & Cons.8. Reference.
What is model ?
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“Spiral model is a combination of sequential and prototype model. This model is best used for large projects which involves continuous enhancements.”
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Spiral Model
(Conceptual view)
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Prototype Model
Sequential model
Spiral Model(Brief History)
The spiral model was defined by Barry Boehm in his 1988 article A Spiral Model of Software Development and Enhancement. This model was not the first model to discuss iterative development, but it was the first model to explain why the iteration matters.
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PHASES of SPIRAL MODEL
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Spiral Model
(Phases)
▸Planning▸Risk Analysis▸Engineering▸Evaluation
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Phases(Planning)
Planning:
In this phase Software analyst communicate with the clients and the necessary requirements such as Business Requirements and System Requirements are gathered.
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Phases(Risk
Analysis)
Risk Analysis:
In this phase analyst assume all the possible risks that could be occurred during future development and alternative solutions are proposed to overcome future risk.
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Phases(Engineering
)
Engineering:In this phase all the necessary coding is done for develop the software also testing done in this phase.
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Phases(Evaluation)
Evaluation:In this phase customer/clients evalute the developed software or the system. After evaluation if customer wishes for more features to add in the software then the process of itaration is continued.
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Spiral Model Structure
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Engineering Evaluation
Prototype 1 Prototype 2 Prototype 3
APPLICATION
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Spiral Model(Application)
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1. When risk evaluation is important for a project.
2. For medium to high-risk projects.
3. Long-term project commitment because of potential changes to economic priorities as the requirements change with time.
4. Customer is not sure of their requirements which is usually the case.
5. Requirements are complex and need evaluation to get clarity.
6. New product line which should be released in phases to get enough customer feedback.
7. Significant changes are expected in the product during the development cycle.
PROS & CONS
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Spiral Model(Pros & Cons)
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This method is consistent with approaches that have multiple software builds and releases and allows for making an orderly transition to a maintenance activity. Another positive aspect is that the spiral model forces early user involvement in the system development effort.
On the other side, it takes very strict management to complete such products and there is a risk of running the spiral in indefinite loop. So the discipline of change and the extent of taking change requests is very important to develop and deploy the product successfully
Spiral Model(Pros)
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1. Changing requirements can be accommodated.
2. Allows for extensive use of prototypes
3. Requirements can be captured more accurately.
4. Users see the system early.
5. Development can be divided into smaller parts and more risky parts can be developed earlier which helps better risk management.
Spiral Model(Cons)
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1. Management is more complex.
2. End of project may not be known early.
3. Not suitable for small or low risk projects and could be expensive for small projects.
4. Process is complex.
5. Spiral may go indefinitely.
6. Large number of intermediate stages requires excessive documentation.
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References
▸ [1] www.tutorialspoint.com, 'SDLC - Spiral Model', 2015. [Online]. Available: http://www.tutorialspoint.com/sdlc/sdlc_spiral_model.htm. [Accessed: 08- Nov- 2015].
▸ [2] Softwaretestinghelp.com, 'Spiral Model - What is SDLC Spiral Model?', 2015. [Online]. Available: http://www.softwaretestinghelp.com/spiral-model-what-is-sdlc-spiral-model/. [Accessed: 08- Nov- 2015].
▸ [3] Istqbexamcertification.com, 'What is Spiral model- advantages, disadvantages and when to use it?', 2015. [Online]. Available: http://istqbexamcertification.com/what-is-spiral-model-advantages-disadvantages-and-when-to-use-it/. [Accessed: 08- Nov- 2015].
▸ [4] Onestoptesting.com, 'Spiral Model | History | The Spiral Model | Applications', 2015. [Online]. Available: http://www.onestoptesting.com/sdlc-models/spiral-model.asp. [Accessed: 08- Nov- 2015].
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