" Be Painstaking in the Hiring Process: Deciding who’s in and who’s out is the most powerful signal any group sends, and successful groups approach their hiring accordingly. Most have built lengthy, demanding processes that seek to assess fit, contribution (through deep background research and extensive interactions with a large number of people in the group), and performance (increasingly measured by tests). "

― Daniel Coyle , The Culture Code: The Secrets of Highly Successful Groups