Please note that as of October 24, 2014, the Nokia Developer Wiki will no longer be accepting user contributions, including new entries, edits and comments, as we begin transitioning to our new home, in the Windows Phone Development Wiki. We plan to move over the majority of the existing entries. Thanks for all your past and future contributions.
The Six Characteristics of Quality
According to ISO/IEC 9126, the international standard for software evaluation, quality characteristics are functionality, usability, reliability, efficiency, portability and maintainability.
-The functions of the software application meet the set requirements
-The software is implemented so that it complies with the relevant standards, allowing interoperability between different systems and client devices
-Issues related to security are considered
-The users perceive the application easy to learn and to use
-The application allows the users to perform their tasks in a consistent and efficient manner
-Quality and usable application is simple and hides the complex technology and implementation from the user
-The probability of failure-free operation of a computer program in a specified environment for a specified time
- Efficiency and performance
-The application operates efficiently in the target environment, performing the tasks in an appropriate time frame while utilizing a reasonable amount of system resources
-In the mobile environment, the device performance capabilities and network connectivity issues are constantly improving, but still require special attention and effective resource usage is essential
-The application can be trandferred from one environment or target device to another in an efficient manner
-It is possible to make changes such as feature updates and correction patches to the software if necessary
Read more about quality from http://www.developer.nokia.com/Design/Design_process/Getting_started/Testing_usability_and_evaluation.xhtml