Functionality : Functions that satisfies the specified requirements.

- Reliability : A set of attributes that are capable of software maintenance under specified conditions.

- Usability : A set of attributes that is capable of effort bearing on individual's performance.

- Efficiency: A set of attributes that are capable of balancing the relationship between performance of software and the resources used.

- Maintainability: A set of attributes that are capable of bearing the effort required for specific modifications.

- Portability: A set of attributes those are capable to bear on the ability of the software to be transferred on another environment.