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The degree to which a user interface enables pleasing and satisfying interaction for the user.

The process of encoding information so that only authorized parties can retrieve the original information, usually by means of a specific decryption key or process.

A device, computer program, or system that accepts the same inputs and produces the same outputs as a given system. [IEEE 610] See also simulator.

An entity or property used as a basis for test Coverage, e.g. equivalence partitions or code statements.

A group of software development methodologies based on iterative incremental development, where requirements and solutions evolve through collaboration between self-organizing cross-functional teams.

A security attack that is intended to overload the system with requests such that legitimate requests cannot be serviced.

A program point at which the control flow has two or more alternative routes. A node with two or more links to separate branches.

The criteria to define the coverage items required to reach a test objective

The degree to which a component or system ensures that data are accessible only to those authorized to have access.

The simultaneous execution of multiple independent threads by a component or system.