Software Reengineering

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Software Reengineering

• Done by Fatima Abdelkader Haouari
• 2001/59617

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Reengineering

• What is it?
• Rebuilding a software to create a more
• powerful product.
• Who does it?
• -Organizational level business specialists.
• -Software levelSoftware engineers.
• Why it is important?
• The rapid change in information technology.
  
  

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Reengineering

• What are the steps?
• Step 1 Business process reengineering. (BPR)
• The search for, and the implementation of,
  radical
• change in business process to achieve
  breakthrough
• results.
• Step 2 Software reengineering process.
• Rebuilding a software to create another with
  added
• functionality, better performance and reliability.

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Business process reengineering

• Business process A set of logically related
  tasks performed to achieve a defined business
  outcome.
• Business process reengineering (BPR) The search
  for, and the implementation of, radical change in
  business process to achieve breakthrough results.

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A BPR model

• A model for business process reengineering
  defines six activities.

Business Definition
Process Identification
Refinement and instantiation
Process Evaluation
Prototyping
Process specification and design
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A BPR model Activities

• Business definition business goals are
  identified.
• Process identification processes critical to
  achieving business goals are identified and
  prioritized.
• Process evaluation existing processes are
  analyzed and measured, costs and time consumed by
  processes are noted, quality/performance problems
  are isolated

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A BPR model Activities

• Process specification and design use cases are
  prepared for each process that is to be
  redesigned.
• Prototyping used to test processes before
  integrating them into the business.
• Refinement and instantiation business processes
  are refined and then instantiated within a
  business system

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Software reengineering process

• Definition Rebuilding a software to create
  another
• with added functionality, better performance and
  
• reliability.

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Software reengineering process model

• Software reengineering process model defines six
  activities.

Inventory analysis
Document restructuring
Forward engineering
Reverse engineering
Data restructuring
Code restructuring
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Software reengineering process model activities

• Inventory analysis sorting active software
  applications to identify reengineering
  candidates.
• Document restructuring There are three options
• to live with weak documentation.
• update poor documents if they are used.
• fully rewrite the documentation.
• Reverse engineering Analyzing the program to
  create a representation of the program in a
  higher level of abstraction than source code.

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Software reengineering process model activities

• Code restructuring source code is analyzed and
  violations of structured programming practices
  are noted and repaired.
• Data Restructuring current data architecture is
  dissected and data models are defined, existing
  data structures are reviewed for quality.
• Forward engineering recovers design information
  from existing source code and uses this
  information to reconstitute the existing system
  to improve its overall quality and/or performance.

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Questions

• Question1 Which of the following activities is
  not part of the software reengineering process
  model?
• A) forward engineering
• B) inventory analysis
• C) prototyping
• D) reverse engineering

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Questions

• Question2 The software reengineering process
  model includes restructuring activities for which
  of the following work items?
• A) code
• B) documentation
• C) data
• D) all of the above

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Questions

• Question3 Which of these benefits can be
  achieved when software is restructured?
• A) higher quality programs
• B) reduced maintenance effort
• C) software easier to test
• D) all of the above

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Thank you

• Fatima Abdelkader Haouari
• 2001/59617