What's your greatest weakness? If you're trying to find the best employees, it might well be asking that question.
Many of the common questions people ask in job interviews aren't actually that helpful in predicting how well a person will do in a job, experts say. Instead of finding the best job candidates, they end up finding the people who are best at selling themselves in job interviews.
"There are some really good people out there who are not glib, and because they're not glib they're not getting the job," said Priscilla Claman, president of the consulting firm Career Strategies, based in Boston.
In general, researchers say the entire job interview process can work against finding the best candidate because it favors people who are sociable, practiced at interviewing and have physical traits such as being tall or having nice teeth.
"What it does is it amplifies all the biases that we have," said Lauren Rivera, an associate professor of management and organizations at Northwestern University's Kellogg School of Management.
Rivera's research has shown that employers also tend to hire people they'd like to hang out with.
Of course it's important for employees get along, but Rivera said there's a danger in relying too heavily on that, and not enough on whether the person has the skills to do the job.
"There are a lot of well-like people who aren't particularly competent," she said.
Instead of asking cutesy, hypothetical or casual questions, researchers say employers are better off asking every candidate consistent, concrete questions that are directly related to the job the person is going to be doing.
Jeffrey Daum, CEO Emeritus at the consulting firm Competency Management Inc., said he urges employers to base their questions on the qualities they see in the best employees they already have. Those may not be the same skills that make people good job interviews, like being extroverted or extremely well spoken.
"If the person isn't going to be a public speaker as the primary aspect of their job, then their ability to communicate in a flowing manner is far less important than the content of what they're communicating to you," Daum said.
Here are some of the worst offenders.
What's your greatest weakness?
Questions about a person's greatest strength or weakness don't do much more than tell you how well a person has been trained to answer interview questions, researchers say. Ditto for the old nugget, "Where do you see yourself in five years?"
Rivera's pet peeve: "Tell me about a time that you demonstrated leadership."
"It tests someone's familiarity with the type of stories you're supposed to tell an employer," she said.
How many garbage cans are there in New York City?
Jobseekers have been inundated in recent years with oddball logic questions like, "How many red cars are there in Cleveland?" or "If you were a pizza deliveryman, how would you benefit from scissors?"
These questions are meant to show how a person thinks, but the answers are way too subjective to give you a good idea of how you can do a particular job, Claman said. They also work against people who just don't see the logic in being asked a question that's totally unrelated to their ability to do a job.
"It won't pick the person who says, 'What the hell is this person asking this stupid question for?'" she said.