How does the park assist feature work on the Audi A1?

I want to know more about the park assist feature on the Audi A1. How does it work and does it only work on certain parking spaces?

The park assist feature on the Audi A1 uses ultrasonic sensors to scan and measure the size of the available parking space. It then automatically steers the car into the space while the driver controls the pedals and gears.

I've found that the park assist feature works best in perpendicular parking spaces. It does not work well in parallel parking or angled parking spaces.