ISO 9126 is an international standard for software product
quality. The standard has six quality elements; functionality,
reliability, usability, efficiency, maintainability and
portability. ISO 9126 part 1 is an extension of previous work
done by [24], [25]. ISO 9126 specifies and evaluates the
quality of the software product in terms of internal and
external software qualities and their connection attributes [21],
[26].