Defects and failures[edit]Not all software defects are caused by coding errors. One common source of expensive defects is requirement gaps, i.e., unrecognized requirements that result in errors of omission by the program designer.[5]:426 Requirement gaps can often be non-functional requirements such as testability, scalability, maintainability, usability, performance, and security.Software faults occur through the following processes. A programmer makes an error (mistake), which results in a defect (fault, bug) in the software source code. If this defect is executed, in certain situations the system will produce wrong results, causing a failure.[6] Not all defects will necessarily result in failures. For example, defects in the dead code will never result in failures. A defect can turn into a failure when the environment is changed. Examples of these changes in environment include the software being run on a new computer hardware platform, alterations in source data, or interacting with different software.[6] A single defect may result in a wide range of failure symptoms. - Study24x7
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Defects and failures[edit]Not all software defects are caused by coding errors. One common source of expensive defects is requirement gaps, i.e., unrecognized requirements that result in errors of omission by the program designer.[5]:426 Requirement gaps can often be no...

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