When it happens, and let's all hope you will still be able to handle what follows, you will be quite upset, under shock, or totally pissed. In other words, you won't necessarily have all your wits together.
The attached Accident Report Form will help you to collect all the important information of your opponent, so you'll be relaxed when insurance time comes.
Use the scooter image to mark damages on your Vespa (sorry, this form will not work for other brands ).
Make notes beyond the questions, so you'll have a better position later, when the opponent contests.
Keep the form in your glove box or pet carrier, and most importantly, never get in a situation where you actually need it