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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