Let’s discuss a psychological test or measurement that you find particularly

 
Let’s discuss a psychological test or measurement that you find particularly interesting (maybe one you could use in a future dissertation).
Briefly describe the test/measurement for us:
What is the name of the test (cite and reference authors)?
What does it measure?
How does it measure the construct (scale properties)?
Who is the target population for test?
What are the qualifications required to administer and interpret this test?