Definitions for "Testability"
The extent to which an objective and feasible test can be designed to determine whether a requirement is met
Testability, a property applying to an empirical hypothesis, involves two components: (1) the logical property that is variously described as contingency, defeasibility, or falsifiability, which means that counterexamples to the hypothesis are logically possible, and (2) the practical feasibility of observing a reproducible series of such counterexamples if they do exist. In short, a hypothesis is testable if there is some real hope of deciding whether it is true or false of real experience. Upon this property of its constituent hypotheses rests the ability to decide whether a theory can be confirmed or falsified by the data of actual experience.
The degree to which someone can unit-test, system test and functionally test a software system. This idea also extends to the ease with which a test plan can be developed from the projects requirements.
(1) a developer-oriented quality requirement specifying the ease with which an application or component facilitates the creation and execution of successful tests (i.e., tests that cause failures due to underlying defects).(2) a quality factor measuring the ease with which an application or component facilitates the creation and execution of successful tests. Note that testability is a combination of controllable and observability.
The ease with which the functionality and performance level of the system can be tested (after each modification) and how fast this can be done.
A proposition is testable if there is such a procedure that assesses the truth-value of a proposition with a high confidence level.
A metric used to measure the characteristics of a requirement that enable it to be verified during a test.
Attributes of software that bear on the effort needed for validating the modified software. (ISO 9126: 1991, A.2.5.4)