A lot of them don't take designing their projects seriously. I tell them to look at designs that are like the one they are working on and they will have a better feel for what needs to be done. But 80% never take the time to do this. Then I show them what I mean and they get it, but they still don't implement. The students finally do this, and have a successful piece of work but by this time it's usually too late to hand it in.
