The Difference in Defect, Error, Bug, Failure, and Fault!

Testing is the method of classifying errors, where a defect is any variance between actual and required results. Some mistake in coding is called Error, error detected by the tester is called Defect, defect allowed by the development team, when it is called Bug, the form does not match the requirements when it does fail.

DEFECT: This can be described as a variation between required and actual. A fault is an error found AFTER the application goes into production. It commonly refers to some troubles with the software products, with its external behavior or with its internal features. Defect is the difference in expected and actual results in the context of testing. This is the difference between customer requirements.

This Defect can be Categorized into the following:

Wrong: When requirements are implemented, not in the right way. This defect is a deviation from the given specification. It is Wrong!

Missing: Some requirement of the customer that was not fulfilled. This is a variance from the specifications, indicating that a specification was not implemented, or the customer’s condition was not noted accurately.

Extra: A requirement included in the product that was not given by the end customer. This is forever a variance from the specification, but maybe a quality desired by the product’s user. But, it is considered a defect because it’s a variance from the existing requirements.

ERROR: An error is a mistake, fault, or misunderstanding of a software developer. In the category of developers, we include software engineers, programmers, analysts, and testers. For example, a developer may misunderstand a de-sign notation, or a programmer might mistype a variable name – leads to an Error. It is the one that is generated because of the wrong login, loop, or syntax. The error commonly arises in software; it leads to a change in the functionality of the program.

BUG: Some bug is the result of a coding error. An error is found in the development environment before the product is shipped to the customer. A programming error that makes a program to work poorly produce incorrect results or crash. An error in software or hardware that causes a program to fail. The bug is the terminology of Tester.

FAILURE: Any failure is the inability of a software system or component to perform its needed functions within specified performance requirements. If a defect reaches the end customer, it is called a Failure. During development, Failures are usually seen by testers.

FAULT: An incorrect step, rule, or data definition in a computer program that lets the program show into an unintended or unanticipated manner. A fault is introduced into the software as the result of an error. It is an oddity in the software that may cause it to act wrongly, not according to its specifications. This is the result of the error.

The software industry cannot yet allow on the descriptions for all the above. In reality, if you use the term to mean one particular thing, it may not be known to be that thing by your audience.

So, this article about The Difference in Defect, Error, Bug, Failure, and Fault!