Talked with my wife, she'll try to drum up some research links, but in the mean time, I picker her brain for a few minutes, and we came up with this:
Honesty is a huge factor. She mentioned a blog post by a semi-well known HR professional Tim Sackett that ends on a very telling note: "Here’s my take on candidate lies – candidates continue to lie, because Talent/HR Pros don’t call them out on it. We (HR) also perpetuate this problem by hiring the folks who give you the crappy lie, but don’t hire the folks who come clean and tell you the truth." Here's a link [ http://www.timsackett.com/2013/07/24/top-candidate-lies/ ] but the lies were less important than the fact that interviewers ignore the honesty and look only at the "problem" that was revealed. She said if someone told her "yes there was crime X from ten years ago," it's more important to evaluate their honesty about it and the circumstances than simply crossing that person off the list, for example. Did they bounce a check, or get a single DUI in college? Is that really relevant when they're 35? Isn't that level of honesty a good sign?
Another aspect of honesty was revealed by that study that came out last year: http://www.cbc.ca/news/business/narcissists-do-better-on-job... "Narcissists or shameless self-promoters do better in job interviews than more modest personalities, a study by University of British Columbia researchers finds"
She read the study and felt it was very insightful and academically solid. Again, interviewers examine the delivery but not the substance. Which is better, someone who says, "Yes, I'm very proficient" to every skill question, or someone who honestly says, "I'm very god with XYZ but I do feel there's room for improvement"? It turns out the latter winds up being a more conscientious and useful employee, but they don't perform as well in interviews.
Testing is huge, as well. There are a lot of companies that use it, but some, like ProMetric tests given to low level retail employees are still flawed, and don't use sound methodologies in eliminating biases in answers.
In my own businesses, she's helped me create better hiring methods, and I went from never hearing about "I/O Psychology" to wondering why more people don't know about that seemingly very valuable type of professional.
Note: I'm not trying to blow my own horn or even my wife's, but simply point out that there's a lot of science in HR that a lot of companies don't utilize. HR is more than managing people like machines.