The selection process is very structured and thourough. From the very first contact, I was made aware of the criteria (personality traits based), setting (treat every interaction with Gartner as a sales call/meeting), purpose (mutually decide if you/Gartner are a good match) and next steps. These were consistently and professionally followed for all the 5 stages, I always received in depth feedback and had every question of mine addressed in full transparency.
In terms of process: calls with talent acquisition (deep focus on traits), calls/meeting with hiring manager (testing and challenging you: the manager would play a role to see how you would react to an aggressive/abrupt approach, how you would deal with a long silence on the other side, how you would reply to a totally random and irrelevant question etc) and final role play with 2 hiring managers and regional vice president.