This presentation summarizes the "b" Shaped Model of system development. The model consists of iterative phases from inception through operation and maintenance. It begins with identifying needs in the inception phase. This is followed by analysis to define problems and specifications, then design of system structure and implementation. Next is the production phase for coding, testing, and training. Once live, the system enters the operation phase and continuous maintenance cycle with ideas for improvements feeding back into new inception phases. The "b" model allows for flexibility and reversing between phases if needed. However, it can be slow for changes as each requires reanalysis and design.

1. Middle East University
Faculty of IT
Department of CIS
Master Program 2012-2013
This presentation edited as a requirement assignment in Information System
Development “ISD: 40201722 ” course
Edited By:
Jasour A.Obeidat
Supervised By:
Dr. Hebah Nassir dean
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2. “b” Shaped Model
Flow of contents
• Introduction.
• “b” Shaped Model illustration.
• “b” Shaped Model phases.
• “b” Phase: Inception.
• “b” Phase: Analysis & Design.
• “b” Phase: Operation & Production.
• “b” Shaped Model Advantages.
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3. “b” Shaped Model
Introduction
• The “b” shaped model Devised by Birrell
and Ould.
• The whole of system development life
cycle in this model presented as a vertical
line and leads to:
 Maintenance cycle at the bottom.
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4. “b” Shaped Model
Introduction (CON’T)
• Each stage of the model is important and
no stage independent of the others.
• Analysts need to be aware of all other
stages in the life cycle and not their part
of it.
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5. “b” Shaped Model
“b” Shaped Model illustration
Note:
Double arrow between each
phase.
Whole Sequence = b letter
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6. “b” Shaped Model
“b” Phase- Inception
• The “b” model life cycle begin with
inception.
• This phase represent identification of the
need for a new computer system.
• Inception -> Analysis
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7. “b” Shaped Model
“b” Phase- Analysis.
• The objectives of the Analysis phase are:
 Define the problem.
 Create detailed specification of what
system have to do?
 To agree with customer about the level of
service and performance .
 Defining the feasibility study in order to
commit project resources .
Analysis -> Design
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8. “b” Shaped Model
“b” Phase- Design.
• The objectives of Design phase are:
 Define the structure and content of system.
 Specify how the system will be
implemented?
 Within this phase we design :
Interfaces Dialogues Input Output
Design -> Production
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9. “b” Shaped Model
“b” Model Phase: Production.
• During this phase :
 Code is created.
 Code is tested.
 Manuals and Documentation published.
 Data from previous system are converted
formally to be used by the new one.
 Training courses designed and
implemented.
Any testing at this stage is conducted by client to
make sure is it close to what they requested ???
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10. “b” Shaped Model
“b” Model Phase: Operation
• After Completing Development System
“goes alive”.
• Operation phase started by using the
system in the business which leads for
system evaluation.
• In this time “Maintenance Cycle” started
by making inception of ideas and
improvements over the system.
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11. “b” Shaped Model
“b” Shaped Model Advantages
• Flexible by its interaction with system
requirements.
• More than one change may be moving
through maintenance cycle at the same
time.
• Possibility in making reverse to the
previous phase if any error occur.
•
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12. “b” Shaped Model
“b” Shaped Model Disadvantages
• Slow in change; for each modification
there are another analysis and design
phase for new requirements associated
with change which leads for investigation
and understood again.
• What can we say else ….?????
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13. “b” Shaped Model
The End
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14. “b” Shaped Model
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