Avoid 90% of Hiring Mistakes by Checking References
Almost all employers ask for references, but few actually check them, even though it is a crucial part of the hiring process.
About 90% of hiring mistakes could be avoided just by checking references. Unfortunately, many employers rely on their own impressions of the candidate based on their resume, application, and interview.
Before You Check
Always ask permission from the candidate, either verbally or with a signature on an application form.
What to Ask
Always check the entire list of references the candidate has (never check just one). Check them yourself so that you are hearing the information directly. This also allows you probe for additional details if necessary. It is often these tidbits of information that are most revealing.
Treat reference checking with as much care and attention as the interview process. Try to avoid yes-or-no answers. Hesitant or vague answers should set off alarm bells. For example, you must know how and why the candidate left their last job.
The Crucial Question
For obvious reasons, one of the most revealing questions is: "Would you hire this person again?"

