Who — The A Method for Hiring

The Costliest Mistake in Business

Geoff Smart and Randy Street open Who with a statistic that stops most leaders cold: the average hiring manager makes a consequential hiring mistake roughly half the time, and each mis-hire at the managerial level costs the organisation fifteen times that person’s annual salary when lost productivity, severance, and opportunity cost are factored in. Despite this, most hiring processes remain embarrassingly informal — a résumé skim, a gut-feel interview, a few reference calls treated as formalities. Smart and Street spent years interviewing over thirteen hundred of the world’s top private equity investors and business leaders to understand what the best hirers do differently. The result is the A Method: a four-part system built on scorecards, structured sourcing, disciplined interviews, and rigorous reference checks. It is not glamorous, but it works, and Who is essentially a field manual for installing it.

The Scorecard and the Who Interview

The foundation of the A Method is the Scorecard — a written document completed before a single candidate is contacted. It defines the mission of the role, the three to eight outcomes that would constitute genuine success in the first year, and the competencies required to achieve them. Most managers skip this step entirely, advertising a role with a vague job description and then making an emotional decision about whoever interviews best. The Scorecard forces clarity: if you cannot write down what success looks like, you cannot evaluate candidates against it. The central interview technique, called the Who Interview, is a chronological walkthrough of the candidate’s entire career. At each role, the interviewer asks the same sequence of questions: what were you hired to do, what accomplishments are you most proud of, what were your low points, why did you leave? The pattern that emerges across five or six positions is far more predictive than any single clever behavioural question, because it reveals how the person actually performs over time rather than how well they can construct a compelling answer under pressure.

References, Sources, and Building an A-Player Culture

Smart and Street are particularly emphatic about reference checks, which most hiring managers treat as a box-ticking exercise. Done properly — by phone, using structured questions, and speaking directly with former managers rather than colleagues the candidate selects — reference checks are among the highest-signal inputs in the entire process. The authors recommend ending every reference call with a simple question: “Would you hire this person again?” and then listening carefully to the hesitations. The book also addresses sourcing, arguing that the best candidates are rarely found through job postings. Top performers are typically already employed and not looking; finding them requires proactive networking, internal referrals, and building a pipeline before the need becomes urgent. Taken together, the A Method demands considerably more time per hire than most organisations currently invest — but Smart and Street make a compelling case that the return on that investment, measured in reduced turnover and elevated team performance, is among the highest available to any leader.

Our rating: 4.3/5 — A concise, research-grounded hiring system that removes most of the guesswork from one of leadership’s most consequential decisions.