What is software testing?

• Testing is the process of executing a program or system with the intent of finding error [Myers, 1979]
• Testing is any activity aimed at evaluating an attribute of a program or system. Testing is measurement of software quality [Hetzel, 1983]
• The process of analyzing a software item to detect the differences between existing and required conditions and to evaluate the features of the software items (IEEE Std 829-1983)
• Testing is the process of exercising or evaluating a system or system component by manual or automated means to verify that it satisfies specified requirements.