Degree with which a solution is able to grow or evolve to handle increased amounts of work.

Ease with which a solution or component can be modified to correct faults, improve performance or other attributes, or adapt to a changed environment.

Degree to which the solution is operable and accessible when required for use, often expressed in terms of percent of time the solution is available.

Requirements dealing with local languages, laws, currencies, cultures, spellings, and other characteristics of users, which requires attention to the context.