I have heard of many people who use only their gut to evaluate a candidate. Remember by tossing a coin to make a hiring decision, there is fifty percent chance of the candidate being very successful - statistically speaking. By studying the successful hires made by the C-Suite of a top organization they were horrified to discover that their successful hiring record was far below the coin toss method. How did this happen? They had never tracked the leaders' skills in interviewing. Leaders were using their own heuristics to choose candidates. When the new hire turned out to be a poor performer, they blamed the candidate and never for a minute stopped to think that the decision to hire that person was theirs.