how do schools choose who will go on trips when oversubscribed?

[FrameyMcFrame]

DD has just been informed she was 'not successful' in getting a place on the ski trip...
There was no mention in the letter of how they select students and a thorough search of the school website and policies gives no info on how these decisions are made.
Does anyone know how they do it?

I know let to of teachers who do the same 'out of a hat '😂

Zombie!