Fairness is the primary ethical principle that should guide language testing practices. This means that all test takers should have an equal opportunity to demonstrate their language proficiency, regardless of their background or circumstances.

All of the above are examples of unfair testing practices. Using a test that is not valid for the intended purpose can lead to inaccurate results. Administering the test in a language that is not the test taker's native language can put the test taker at a disadvantage. Providing test takers with insufficient time to complete the test can prevent them from demonstrating their full language proficiency.

Informed consent is the process of providing test takers with information about the purpose of the test, the risks and benefits of taking the test, and their rights as test takers. This information helps test takers to make an informed decision about whether or not to take the test.

Language testers have an ethical responsibility to ensure that test taker data is kept confidential, used only for the purposes for which it was collected, and destroyed securely when it is no longer needed. This helps to protect test takers' privacy and prevent their data from being misused.

Language testers have an ethical responsibility to ensure that tests are free from bias against any particular group of test takers, that tests are fair to all test takers, regardless of their background or circumstances, and that tests are valid for the intended purpose. This helps to ensure that all test takers have an equal opportunity to demonstrate their language proficiency.