Tackling ‘the Thin File’ That Can Prevent a Promotion. Iris Bohnet, October 3, 2017, Opinion, “Recently, I have worked with a number of professional services firms committed to equality, diversity and inclusion. Many offer diversity training and leadership development programs, and many support affinity groups for traditionally underrepresented groups.  However, none has been able to crack what sometimes feels like a code set in stone: significantly increased diversity at the entry level, but very little change at the top.Link