Performance is the amount of time a user waits to see a result after requesting an action.
Availability is a measure of the amount of time a system or component performs its specified function; it's uptime.
Security is the degree to which a solution can foil any unauthorized attempts to view or alter data.
Scalability is the ability to achieve an increase in system capacity by seamlessly upgrading additional hardware and software resources.
Maintainability is the measure of how easy it is to maintain an application at an operational level after it is put into production.
Accessibility is the act of creating a GUI that can be used effectively by users with visual, auditory, or physical impairments.
Deployability is the intent to create a solution that requires minimal cost and hassle to distribute and install.
Extensibility is the degree to which an application can be enhanced in the future to meet changing requirements or goals.