All bad hires stem from 2 types of mistakes: What and How.
1) WHAT MISTAKES - Companies don't know what attributes truly matter in a given position, so they end up screening for the wrong things.
[If you've ever hired someone and learned they lacked a crucial attribute you never screened for in the first place, you've been the victim of this 1st mistake.]
2) HOW MISTAKES - Companies know what attributes to measure, but they don't know to accurately measure them.
-I.e., they're screening for the right attributes in the wrong manner.
[If you've ever hired someone you thought had a certain attribute, only to find out you were wrong, you've been the victim of this 2nd mistake.]
Viewing hiring through this What/How framework is a must for accuracy.
If you don't know WHAT attributes matter, figure that out first.
Once you know the WHAT, then you can focus your efforts on determining HOW to accurately/consistently screen for those things.