The Definition of the Bug

The Definition of the Bug
March 29 11:00 2011 Print This Article

In this article I have tried to collect the different definitions of a defect or a software bug. It seems to be something elementary, but it is fundamental, so it is sometimes useful to come back to it.

The Definition of the Bug

“Rapid testing” by Robert Culbertson, Chris Brown, Gary Cobb:

Software error is no more than a flaw in software development, which causes inconsistency of expected results of a software product and in fact the results obtained.

“Testing Dot Com, or benefit the abuse of bugs in Internet startups” Roman Savin

So, the bug is a deviation of the actual result on the expected result.
In accordance to the law of excluded of the third we have a bug if there is any actual result differs from the expected.


In general, developers differentiate software defects and failures. In case of failure, the program does not behave as you expect. Defect – an error / inaccuracy, which may (or may not) be a consequence of the failure.

My definition

Defect is the behavior of the program which makes it difficult or impossible to achieve the goals of user or satisfy the interests of participants. It implies the possibility of correction. If you cannot fix it goes into the discharge limits of technology.
“The interests of members must be understood” in the sense of A. Coburn.

The Definition of the Bug

QATestLab is a team of professionals working in various fields to ensure the quality of IT projects: test managers, manual, automated and load testing test engineers, consultants and trainers.

Related Posts:

  • No Related Posts

About Article Author

view more articles
Nataliia Vasylyna
Nataliia Vasylyna

View More Articles
  • Jonathan

    I like that your definition is phrased in terms of satisfaction of the user.

    To be practical, a bug is something that negatively affects a company’s bottom line, either directly by inhibiting sales (and repeat sales) or indirectly by damaging the company’s reputation.

    Which is to agree with you — if the customer is satisfied, then there’s nothing to fix.