An indirect measure of a product derived from measures of the behaviour of the system of which it is a part. [ ISO/IEC 9126-1, ISO/IEC 14598 ]
- The system includes any associated hardware, software (either custom software or off-the-shelf software) and users. [ ISO/IEC 9126-1 ]
- The number of failures found during testing is an external measure of the number of faults in the program because the number of failures are counted during the operation of a computer system running the program. [ ISO/IEC 9126-1 ]
- External measures can be used to evaluate quality attributes closer to the ultimate objectives of the design. [ ISO/IEC 9126-1 ]
