GSoC Proposals: Level of Detail

[dsimcha]

I've been looking over some of the GSoC proposals and I've noticed that 
most aren't very detailed.  It seems most of the students have only a 
very rough idea of what they want to do and plan on filling in the 
details at the beginning of the project.  I don't have experience with 
GSoC and I'm trying to understand whether this is a problem or is what's 
expected.  How detailed are the proposals supposed to be?