V model in SDLC

Edited By
Jasour A.Obeidat

Supervisor
Dr.Hebah Nassir Deain

Information System Development – 1st Semester 2012-2013

Outline

• “V” Model in Progress.
• “V” Model illustration.
• “V” Model Advantages.
• “V” Model Disadvantages.
• Comparison between “Waterfall” Vs. “V”
Models.
• Examples (Problem Scenario).


Outline
• System Development Life Cycle SDLC.

Models.


Outline

Models.


Outline



Outline
Models.


System Development Life Cycle SDLC
• System development process:
Is a structure imposed on the development of a system
product.

• There are several models represent system product in
it’s processes:
- Waterfall Model
- V shaped Model
- EXTREM Programming
- …etc.


“V” Model Illustration


“V” Model in Progress “Procedures”
• The “V” Model begin with elicitation of system
requirements in order to conceptualize the system.

• Once the system concept is formed, requirements are
further elicited, in order to specify detailed system
requirements.

Note:
These system requirement are then allocated to system
components. (e.g. H/W, S/W, firm works, and people)


• The system is designed.

• Once the system is designed the detailed
software requirements are elicited.

• Note :
These software requirements are then used to
design, construct, and test appropriate
component of the system .


• Eventually, all of the system components are
integrated and tested when Evidence Exist?

- That the resulting system meets
requirements.

- The system and its components
are accepted.


• The “V” Model integrates planning and
execution of testing throughout the life cycle.
During requirements elicitation and analysis

Acceptance test planning Initiated -Executed prior to
developing the system

During design activities

System Integration test planning -Executed after S/W coded
Initiated and TESTED


“V” Model Advantages
• Simple and easy to use.

• Specific goals are defined for each phase.

• Focus on preparing test plans early in the process
which give it higher chance to success.

• The user of the “V” Model participate in the
development and maintenance.


“V” Model Advantages
• The “V” Model provide a concrete assistance
on how to implement an activity.

• In each activity schema there are instructions,
recommendations, and detailed explanation
of the activity.

• Appropriate for small development project in
which requirements are well understood.


“V” Model disadvantages
• Difficult to add or change requirements later
in the development process.
• “V” Model is inappropriate for complex
projects.
• The emphasize in test planning appears to
reduce the risk but like the “Waterfall” model
the “V” model risks in :
- Time.
- absence of careful planning.


Waterfall Model Vs. V Shaped Model

Model / Feature Waterfall Model “V” Model
Requirement Beginning Beginning
Specifications
Cost Low Expensive
Guarantee of success Low High
Simplicity Simple Intermediate
Flexibility Rigid Little flexible
Reusability Limited To some extent
User involvement Only at the beginning At beginning
Change incorporated Difficult Difficult


Problem Scenarios
• Example A:

We received a requirement specification from a
client for developing a solution for their specified
problem in a domain we have little or no expertise
and obviously no experience of developing similar
solution.


Problem Scenarios
• Example A: In “Waterfall Model”

This Model is not suitable for using it in this case.
Because :
-Clients may not know the complete vision of the solution .
- No expertise and experience on this domain which reflect
that we can’t gather complete requirements, and that leads
for troubles due new findings.


Problem Scenarios
• Example A: In “V” Model

This is not suitable for using it in this case because:
-It is similar to “Waterfall” model except of the
added test phases at each level, so gathering will be
an issue here too.

-No working prototype will be available because
there is not any incremental/ modular/ iterative
approach.


???


Problem Scenarios
• This is my Question???????

We received a requirement specification from a
client for developing a solution for their specified
problem in domain. We have expertise and
experience of developing similar solutions


The End !


V model in SDLC

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