Difference between Bug/Defect/Error/Mistake/Fault/Failure

 Difference between Bug/Defect/Error/Mistake/Fault/Failure

Software testing also helps to identify errors, gaps or missing requirements in contrary to the actual requirements.

Error and mistake both are same

A human action that produces an incorrect result

Error:- An error is a programming mistake, generated due to incorrect loops or wrong syntax. Thus the birth of an error takes place at the time of coding itself. Its chief causes are an inadequate understanding of the internal structure of code, neglect on the part of memory management, etc.

Types of Errors:

•       Calculation errors due to incorrect approximations or formula .

•       Error in handling of data such as overwriting of same files.

•       Errors due to configuration such as inadequate storage area for memory.

Causes of Errors:

•  Oversight
•  Lack of time
•  Communication gap
•  Inadequate inputs
•  Lack of skill
•  Inadequate training
•  Inadequate review of inputs

Defect , Fault and Bug are same

Bugs

A bug is a programming error found in an application before it goes into production. It may cause the program to perform irrationally, come up with incorrect responses and then crash all together.

Examples :

1. An incorrect statements

2. Data definition

Types of Bugs

•       Algorithmic bugs such as division by zero.

•       Logic bugs such as Infinite loops (a loop having no termination point).

•       Resource bugs due to the use of uninitialized variables.

Defect

In the simplest of terms, defect is the difference observed between expected behaviour and the actual results which are noted post the event of testing a software. Essentially it marks the deviation of the product's performance from the customer's requirements. It differs from a bug in the fact that a defect is found out after the product goes into production.

Types of Defects:

     •       Missing Defects: Occur due to client         requirements not being met.

     •       Wrong Defects: Occur due to incorrect   implementation of requirements. A wrong defect  marks the deviation from the mentioned specification.

Failure

       Failure is a deviation of the component or system from it's expected delivery, service or result

      Example :

       Radiation , magnetism , electronic fields and pollution can damage hardware or firmware , or simply change the conditions of the hardware or firmware temporarily in a way that cause the software to fail.