spiral model of sdlc

22
SPIRAL MODEL of SDLC

Upload: animesh-chakraborty

Post on 11-Apr-2017

846 views

Category:

Education


3 download

TRANSCRIPT

Page 1: Spiral model of SDLC

SPIRAL MODEL of SDLC

Page 2: Spiral model of SDLC

HELLO! We are,

Animesh ChakrabortyAbdullah Al Omar

Albub Yusuf

2

Page 3: Spiral model of SDLC

Overview

3

1. Definition.2. Conceptual view.3. Brief History.4. Phases.5. Structure.6. Application.7. Pros & Cons.8. Reference.

Page 4: Spiral model of SDLC

What is model ?

4

Page 5: Spiral model of SDLC

“Spiral model is a combination of sequential and prototype model. This model is best used for large projects which involves continuous enhancements.”

5

Page 6: Spiral model of SDLC

Spiral Model

(Conceptual view)

6

Prototype Model

Sequential model

Page 7: Spiral model of SDLC

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.

7

Page 8: Spiral model of SDLC

PHASES of SPIRAL MODEL

8

Page 9: Spiral model of SDLC

Spiral Model

(Phases)

▸Planning▸Risk Analysis▸Engineering▸Evaluation

9

Page 10: Spiral model of SDLC

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.

10

Page 11: Spiral model of SDLC

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.

11

Page 12: Spiral model of SDLC

Phases(Engineering

)

Engineering:In this phase all the necessary coding is done for develop the software also testing done in this phase.

12

Page 13: Spiral model of SDLC

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.

13

Page 14: Spiral model of SDLC

Spiral Model Structure

14 PlanningRisk Analysis

Engineering Evaluation

Prototype 1 Prototype 2 Prototype 3

Page 15: Spiral model of SDLC

APPLICATION

15

Page 16: Spiral model of SDLC

Spiral Model(Application)

16

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.

Page 17: Spiral model of SDLC

PROS & CONS

17

Page 18: Spiral model of SDLC

Spiral Model(Pros & Cons)

18

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

Page 19: Spiral model of SDLC

Spiral Model(Pros)

19

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.

Page 20: Spiral model of SDLC

Spiral Model(Cons)

20

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.

Page 21: Spiral model of SDLC

21

THANKS!Any questions?You can find us at

[email protected][email protected][email protected]

Page 22: Spiral model of SDLC

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].

22