CM5151001 Business Systems Analysis, Design and Construction BSADC

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CM515100-1 Business Systems Analysis, Design
and ConstructionBSADC

• Week 10

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Quality What is it?
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Quality?

• To the uninitiated, quality is confusing
• QI - Quality Inspection
• QC - Quality Control
• QA - Quality Assurance
• TQM - Total Quality Management

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QI - Quality Inspection

• End of development life cycle checks and
  screening out of faults
• Error detection
• Black box and white box testing
• Beta testing
• Ratification
• Commissioning Tests software is up to
  specification

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QC - Quality Control

• A more systematic approach
• Statistical analysis methods used
• To identify appropriate inspection levels
• To identify problem areas
• Process Performance
• Quality Standards

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QA - Quality Assurance

• Widening the responsibility for quality to
  non-direct functions
• Quality systems
• Quality Costing
• Problem Solving
• Quality Planning

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TQM Total Quality Management I

• A corporate way of life
• Whole operation involved
• Quality Strategy
• Teamwork
• Staff Empowerment
• Involves suppliers and customers

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TQM Total Quality Management II

• Specifically concerned with
• Meeting and exceeding the needs and expectations
  of customers
• Covering all parts of the organisation
• Including every person in the organisation
• Examining all costs which are related to quality

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TQM Total Quality Management III

• Specifically concerned with
• Getting things right first time designing in
  quality rather than inspection
• Developing the systems and procedures which
  support quality and improvement
• Developing a continuous process of improvement

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The Inverted Quality Triangle
Involvement in Organisation
Potential Impact on Organisation
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Quality in Software Development

• Many properties can be used to characterise
  software development quality
• Fitness for purpose
• Compliance with customer/specification
  requirements
• Some quality properties are mandatory
• Correctness
• Reliability
• Efficiency
• Effectiveness

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The Quality Process

• Each lifecycle step will have a set standard or
  benchmark against which its quality can be
  tested and demonstrated
• feasibility study quality standard benchmarks
• design quality standard benchmarks
• code quality standard benchmarks
• documentation quality standard benchmarks
• etc

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Standards

• Process Standards define how the process should
  be conducted
• Product Standards define how the final products
  should be

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Alpha and Beta Testing

• Alpha testing
• Verification Implementation team confirms,
  after testing, that the system is compliant
• Beta Testing
• Validation Independent testing of the system
  and the documentation confirms that the mandatory
  criteria/ standards/benchmarks have been met or
  exceeded.

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Certification

• In some cases it is not sufficient that the
  software process is just verified and the
  software itself validated through alpha and beta
  testing.
• In such circumstances, the software behaviour
  (and other systems components) needs to be
  evaluated in live operating circumstances.
• Then the system is exposed to its real operating
  environment for a determined period (say 3 to 6
  months) and, if successful during that time, it
  is certified.

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Quality has a Cost!

• Getting the balance right
• Prevention Costs
• Appraisal Costs
• Failure Costs

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Prevention Costs

• Those costs incurred in trying to prevent
  problems
• Identifying potential problems putting the
  process right before poor quality happens
• Improving the design of products and processes to
  reduce quality failures
• Training and Development of Personnel

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Appraisal Costs

• Those costs associated with with controlling
  quality
• The setting up and running of statistical process
  controls programmes
• The setting up of acceptance sampling plans
• Obtaining process inspection and test data
• Investigation quality problems and providing
  quality reports
• Customer surveys and quality audits

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Failure Costs

• Internal Failure Costs
• The cost of scrapped software
• Reworked software
• Lost time as a result of coping with errors
• External Failure Costs
• Loss of customer goodwill
• Litigation
• Guarantee and warranty costs

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You choose which cost to incur
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Self Study

• Read this
• http//www.developer.com/java/other/article.php/35
  15426

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Next week

• Human Computer Interaction

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Tutorial

• Assignment Workshop