Difference between Bug, Defect, Error, Fault & Failure
Last updated: February 21, 2024 Read in fullscreen view
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Bug vs. Defect vs. Error vs. Fault vs. Failure
Here are the vital differences between bug, defect, error, fault, and failure
| Comparison basis | Bug | Defect | Error | Fault | Failure |
|---|---|---|---|---|---|
| Definition | It is an informal name specified to the defect. | The Defect is the difference between the actual outcomes and expected outputs. | An Error is a mistake made in the code; that's why we cannot execute or compile code. | The Fault is a state that causes the software to fail to accomplish its essential function. | If the software has lots of defects, it leads to failure or causes failure. |
| Raised by | The Test Engineers submit the bug. | The Testers identify the defect. And it was also solved by the developer in the development phase or stage. | The Developers and automation test engineers raise the error. | Human mistakes cause fault. | The failure finds by the manual test engineer through the development cycle. |
| Different types | Different type of bugs are as follows:
|
Different type of Defects are as follows: Based on priority:
|
Different type of Error is as below:
|
Different type of Fault are as follows:
|
----- |
| Reasons behind | Following are reasons which may cause the bugs: Missing coding Wrong coding Extra coding |
The below reason leads to the defects: Giving incorrect and wrong inputs. Dilemmas and errors in the outside behavior and inside structure and design. An error in coding or logic affects the software and causes it to breakdown or the failure. |
The reasons for having an error are as follows: Errors in the code. The Mistake of some values. If a developer is unable to compile or run a program successfully. Confusions and issues in programming. Invalid login, loop, and syntax. Inconsistency between actual and expected outcomes. Blunders in design or requirement actions. Misperception in understanding the requirements of the application. |
The reasons behind the fault are as follows: A Fault may occur by an improper step in the initial stage, process, or data definition. Inconsistency or issue in the program. An irregularity or loophole in the software that leads the software to perform improperly. |
Following are some of the most important reasons behind the failure: Environmental condition System usage Users Human error |
| Way to prevent the reasons | Following are the way to stop the bugs: Test-driven development. Offer programming language support. Adjusting, advanced, and operative development procedures. Evaluating the code systematically. |
With the help of the following, we can prevent the Defects: Implementing several innovative programming methods. Use of primary and correct software development techniques. Peer review It is executing consistent code reviews to evaluate its quality and correctness. |
Below are ways to prevent the Errors: Enhance the software quality with system review and programming. Detect the issues and prepare a suitable mitigation plan. Validate the fixes and verify their quality and precision. |
The fault can be prevented with the help of the following: Peer review. Assess the functional necessities of the software. Execute the detailed code analysis. Verify the correctness of software design and programming. |
The way to prevent failure are as follows: Confirm re-testing. Review the requirements and revisit the specifications. Implement current protective techniques. Categorize and evaluate errors and issues. |
Poka Yoke / Error Proofing in identifying the errors
Mistake proofing, or its Japanese equivalent poka-yoke (pronounced PO-ka yo-KAY), is the use of any automatic device or method that either makes it impossible for an error to occur or makes the error immediately obvious once it has occurred.
Poka-yoke, also known as mistake- and error-proofing, helps eliminate mistakes / errrors caused by engineers
There are two types of poka-yoke: control and warning..Poke Yoke or mistake proofing means taking steps to ensure errors or abnormalities can't occur.
It can involve using checklists, quality checks, part or tool design, machine modification, setting tolerance limits and so forth.
The ideal PokaYokes are:
- inexpensive
- simple and easy to implement
- specific to the need
- developed by every employee
To enhance the understanding of Pokayoke / Error Proofing, it is important to understand the difference between a defect and an error. We can use the cause and effect diagram to identify the the errors that cause defects to occur.This means that if errors can be prevented, no defects will be created.
By using Error Proofing, the errors that cause defects are located and eliminated.
Error Proofing should be continuously used to locate and prevent new errors.
Conclusion
After seeing all the significant differences between bug, defect, error, fault, and failure, we can say that the several issues and inconsistencies found throughout software are linked and dependent on each other.
All the above terminology affects and change different parts of the software and differ from one another massively. However, all these differences between bug, defect, errors, faults, and failures slow down the software's excellence and performance.
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