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“You never get a second chance to make a first impression” was the tagline for a Head & Shoulders shampoo ad campaign in the 1980s. It unfortunately encapsulates how most interviews work. There have been volumes written about how “the first five minutes” of an interview are what really matter, describing how interviewers make initial assessments and spend the rest of the interview working to confirm those assessments. If they like you, they look for reasons to like you more. If they don’t like your handshake or the awkward introduction, then the interview is essentially over because they spend the rest of the meeting looking for reasons to reject you. These small moments of observation that are then used to make bigger decisions are called “thin slices.”

Tricia Prickett and Neha Gada-Jain, two psychology students at the University of Toledo, collaborated with their professor Frank Bernieri and reported in a 2000 study that judgments made in the first 10 seconds of an interview could predict the outcome of the interview.

The problem is, these predictions from the first 10 seconds are useless.

They create a situation where an interview is spent trying to confirm what we think of someone, rather than truly assessing them. Psychologists call this confirmation bias, “the tendency to search for, interpret, or prioritize information in a way that confirms one’s beliefs or hypotheses.” Based on the slightest interaction, we make a snap, unconscious judgment heavily influenced by our existing biases and beliefs. Without realizing it, we then shift from assessing a candidate to hunting for evidence that confirms our initial impression.

In other words, most interviews are a waste of time because 99.4 percent of the time is spent trying to confirm whatever impression the interviewer formed in the first ten seconds. “Tell me about yourself.” “What is your greatest weakness?” “What is your greatest strength?” Worthless.

Excerpted from Work Rules: Insights from Google that Will Transform How You Live and Lead,

Equally worthless are the case interviews and brainteasers used by many firms. These include problems such as: “Your client is a paper manufacturer that is considering building a second plant. Should they?” or “Estimate how many gas stations there are in Manhattan.” Or, most annoyingly, “How many golf balls would fit inside a 747?”

Performance on these kinds of questions is at best a discrete skill that can be improved through practice, eliminating their utility for assessing candidates. At worst, they rely on some trivial bit of information or insight that is withheld from the candidate, and serve primarily to make the interviewer feel clever and self-satisfied. They have little if any ability to predict how candidates will perform in a job.

Examples of interview questions include:

• Tell me about a time your behavior had a positive impact on your team. (Follow-ups: What was your primary goal and why? How did your teammates respond? Moving forward, what’s your plan?)
• Tell me about a time when you effectively managed your team to achieve a goal. What did your approach look like? (Follow-ups: What were your targets and how did you meet them as an individual and as a team? How did you adapt your leadership approach to different individuals? What was the key takeaway from this specific situation?)
• Tell me about a time you had difficulty working with someone (can be a coworker, classmate, client). What made this person difficult to work with for you? (Follow-ups: What steps did you take to resolve the problem? What was the outcome? What could you have done differently?)

Don’t Leave the Interviewing to the Bosses!

In every interview I’ve ever had with another company, I’ve met my potential boss and several peers. But rarely have I met anyone who would be working for me. Google turns this approach upside down. You’ll probably meet your prospective manager (where possible—for some large job groups like “software engineer” or “account strategist” there is no single hiring manager) and a peer, but more important is meeting one or two of the people who will work for you. In a way, their assessments are more important than anyone else’s—after all, they’re going to have to live with you. This sends a strong signal to candidates about Google being nonhierarchical, and it also helps prevent cronyism, where managers hire their old buddies for their new teams. We find that the best candidates leave subordinates feeling inspired or excited to learn from them.