WIkipedia to trust or not to trust

I think Wikipedia can be a trusted site for some information but not all. I think for something like a simple book report or the history of a person Wikipedia could be a very useful site. I would not trust Wikipedia with a big time project though. If I was using Wikipedia for a big project I would make sure I had other trusted sources backing it up. If I was assigning my students a project and they decided to use Wikipedia I would make sure to tell those students who are going to use Wikipedia to make sure they have another source.