软件测试教学课件：Review.pdf

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ammer: Misunderstanding of design doc, mental lapse while
coding, non-compliance with documentation and coding instructions.
• Quality assurance team: Incomplete test plan, not document and
report detected faults or failures, not promptly correct faults,
incomplete correction of detected errors.
• Operational staff: Procedure errors.
• Technical writer: Omission of software functions, not up-to-date,
error in descriptions.
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Facts on Bug
 Bugs are much more than coding mistakes
 The earlier a bug is found, the cheaper it costs
 Bugs are costly to fix.
 Not all software bugs get fixed after they are exposed.
 ......
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Difficulty of writing bug-free programs
Complexity
• Many parameters
• No two parts of software are alike
• System goes through many states during execution
• Inherent non-linearity
Conformity
 System should conform with standards imposed by
• other components, such as hardware, or
• external bodies, such as existing software
Changeability
 Constant need for change
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Knowledge Point #2
 Quality Assurance and Quality Control
• Quality Assurance vs. Quality Control
• Verification vs. Validation
• Software verification techniques
• Definition of software testing
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Quality Control & Quality Assurance
 Quality Assurance:
• A set of activities designed to ensure that the development and/or
maintenance process is adequate to ensure a system will meet its