To get permission to study product design you have to produce a portfolio in advance and you have to pass a design aptitude test.
I have done it at FH Darmstadt in the design faculty in 1995 and really managed to get 111 out of 170 points and so passed it. But because of some reasons I didn't study it and decided to study computer science.
On this page you will find a few sketches I made additional to the portfolio.
Here are the drawings I made for my portfolio. The pieces should not be older than three months and you should be informed what they prefer at the individual university. At FH-Darmstadt they provide a portfolio consultation.
The portfolio should contain three articles of daily use which I personally take as good design.
I apologize for the bad quality, I just photographed them with my Kodak DC240. But if i get my fingers on a DIN A2 scanner...