I applied through college or university. I interviewed at 3M (Madrid)
Interview
It consists in 2 parts: Online test + Group Interview
Online test was not difficult. There were about 7 people at the group interview. Had to answer questions, solve a case talk in English. It was also very clarifying about the positions offered.
I applied online. The process took 3 months. I interviewed at 3M in Nov 2010
Interview
Everyone at 3M was really friendly. The interview process went very smoothly, except that it took a really long time. 6 months had passed between when I applied for the job and my first day of work.