Test development refers to the branch of test psychology in which we attempt to develop standardized tests and construct them in such a way so that we can reliably measure and understand psychological differences between individuals and groups.

Test evaluation refers to the branch of test psychology in which we consider the psychometric properties of psychological tests, such as reliability and validity. These are essential elements to determine the quality of any test.

Test use refers to the branch of test psychology in which we consider the appropriate, professional and ethical use of psychological tests. It relates to the knowledge and skills required to use different types of tests, and guidelines and good practices on test use.

Clinical evaluation refers to the branch of test psychology in which we use tests to gather and integrate data to evaluate a person's behavior, abilities and other characteristics, particularly for the purpose of making a diagnosis or treatment recommendations.