1. Heuristics of Software Testability by James Bach
    1. http://www.satisfice.com/tools/testability.pdf
    2. The practical testability of a product is how easy it is to test by a particular tester and test process, in a given context
      1. project-related testability
      2. value-related testability
      3. subjective testability
      4. intrinsic testability
      5. epistemic testability ( “risk gap”)
  2. Improving testability of object-oriented systems by Stefan Jungmayr
    1. https://web.archive.org/web/20071009021801/http://www.dissertation.de/index.php3?active_document=%2FFDP%2Fsj929.pdf
    2. The degree to with a software artifact facilitates testing testing in a given context
  3. Software testability by Robert V. Binder
    1. http://robertvbinder.com/software-testability-part-1-what-is-it/
    2. Testability is the degree of difficulty of testing a system
  4. Wiki: Software testability
    1. https://en.wikipedia.org/wiki/Software_testability
    2. Software testability is the degree to which a software artifact (i.e. a software system, software module, requirements- or design document) supports testing in a given test context. If the testability of the software artifact is high, then finding faults in the system (if it has any) by means of testing is easie
  5. Testability
    1. ISO/IEC 25010
      1. Characterizes the effort needed to verify (test) a system change
    2. IEEE90
      1. The degree to which a system or component facilitates the establishment of test criteria and the performance of tests to determine whether those criteria have been met