Phone teleconference with highlights of undergraduate research, on-site interview consisted of more in-depth research presentation, and 1:1's were mainly about listening to current 3M employees about their experience with the company- after the research presentation, I feel like they were mainly trying to sell me on the company rather than quizzing me about my team working style, etc.

First there was an online application form, where you simply fill out all your details and attach your CV, then shortly followed by online tests and if you passed it was phone interview from which I got rejected