For each question, click the question number to listen to the interval on your computer's audio player, or click the arrow under the question number to play here (Flash required); then click the radio button to identify it.

When you are done, click the 'Submit Test' button at the bottom.
You will then get a message indicating which (if any) intervals you need to study more based on your answers, and an 'x' will appear next to the question(s) where you made an error.

To start over, first click the 'Start Over' button at the bottom.