Many, perhaps most, organizations rely on internal mobility – transfers and promotions – to fill a significant portion of their job openings. Which, in turn, has led to a wealth of research on these topics. Professor Ray provides a comprehensive review of this research (some 202 articles in all), emphasizing what we know, but also what we don’t. written mainly for researchers, the review is chock full of findings directly relevant to practitioners as well. here are just a few examples.