Mumbai University > Information Technology > Sem 8 > Software Testing and Quality Assurance

Marks: 5M

Failure:

• A failure is said to occur whenever the external behavior of a system does not conform to that prescribed in the system specification.
• If under certain circumstances the defects get executed by the tester during the testing then it results into the failure which is known as software failure.
• Failure occurs when fault executes.

Defect:

• Defect is the difference between expected and actual result in the context of testing.
• Defect is the deviation of the customer requirement.
• Defect is an error found AFTER the application goes into production.
• A defect occurs only after a mistake done from the developer's end.
• Programmatic errors give rise to software defect.
• In software testing a defect is considered to be anything that can hamper the functioning or execution of the software application or service.
• For instance, a defect can be either a failure of a certain section of the code to function accurately, a flaw in the design of the system, or a fault, which could either be an error in the program.

Error:

• An error is a state of the system. In absence of any corrective action by the system, an error state could lead to a failure which would not be attributed to any event subsequent to the error.
• It the one which is generated because of wrong login, loop or due to syntax.
• Error normally arises in software.
• Error means to change the functionality of the program.
• This is a part of a system state that is liable to lead to a failure.
• Hence the process of failure manifestation can therefore be represented as a behavior chain as follows:

fault ->error ->failure