I applied in-person. The process took 1+ week. I interviewed at Mars (London, England) in Oct 2015
Interview
Completed online application and competency questions. Then went on to online tests (logic). Once they acknowledged that you passed the test, they called for a telephone interview. Interview lasted about 20 minutes and asked questions about your motivation for Mars and the program. Then went on to ask competency questions. After the telephone interview, they notify you within 2 weeks of whether you will go to the assessment centre.
Interview questions [3]
Question 1
Tell me about a time when you tried something new. What did you learn?