What should be in my Portfolio?

I think that a very good portfolio would include great works of art in a variety of different mediums; therefore, i think my   portfolio should include my best pieces and several different mediums. By showing several mediums, a portfolio can display one's ability more accurately. 

After reading the list from MIAD, I have an idea of what to put in my portfolio, but I also found the list to be shorter than I had expected, just very generalized, but it has shown to me that i need to focus mostly on 'real life' and not photographs. I think that making a great portfolio with be stressful, but it won't be to hard to include said pieces because I'm really going to try to step out of my safe zone and include a variety of work and experiment with different medias. The biggest difficulty I'll probably be faced with will be making a realistic self portrait of myself, as I have tried before and it hasn't turned out to my liking. Nothing about the list really surprised me because I know most colleges are looking for well rounded students and want to see a broad spectrum of talent. I'm working on a portfolio in 2D as well as 3D, so i know I'm going to have a lot of work ahead of me creating several pieces in both areas. In my 2D portfolio, I really want to work on paintings and photography along with several other mediums. In 3D, i definitely want to include lots of ceramics, sculpture and thrown pieces, both funtional and decorational. I'm not sure all what colleges I want to show my portfolio to yet, but Webster University and a few schools in Chicago will be seeing it sometime soon, so hopefully I can work hard enough to pull together a decent portfolio.