What is defect or bugs or faults in software testing

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What is Defect or Bugs or Faults in software testing ? Defect is a variance between expected results and actual results of execution of test case on system.

Categories of Defects 1. Functional 2. Non Functional

3. Functional Defects 

Wrong : The software does something that the product specifications says it shouldn’t do.


Missing : The software doesn’t do something that the product specification says it should do.

Extra : The software does something that the product specification doesn’t mention.

Non Functional Defects The defects which is difficult to understand, hard to use, slow etc.

Causes of Defects 

User gives wrong or incomplete requirements.

Analyst interprets requirements incorrectly.

Requirements are not recorded correctly.

Incorrect design.

Error in coding.

Data entry error.

Mistake in error correction.

For more details : What is Defect


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