The one finding the whole book is built on
There is a single, well-replicated result at the centre of this Handbook: a structured interview — the same questions, asked of every candidate, scored against the same rubric — predicts who will actually do the job better than any other interview format, and better than almost any other selection tool an employer can use. That is not our opinion; it is the strongest finding in the field. Across the foundational meta-analysis and its 2022 revision, the validity of a structured interview lands around r = .42–.51 — among the highest of any selection method measured. These are peer-reviewed, so we state them precisely.
- Schmidt, F. & Hunter, J. (1998). “The Validity and Utility of Selection Methods in Personnel Psychology.” Psychological Bulletin 124(2): 262–274.
- Sackett, P. R., et al. (2022). “Revisiting Meta-Analytic Estimates of Validity in Personnel Selection.” Journal of Applied Psychology 107(11): 2040–2068.
The behavioural interview, and the gap you can walk through
Two findings shape the middle of the book; both come from recruiter and industry surveys, so we state them by direction and name the source. Behavioural questions now dominate hiring and are rising — across LinkedIn Talent Solutions' Global Recruiting Trends reporting and SHRM, the spread between surveys reflects who was asked, not whether the practice is common. And only about a third of candidates prepare structured answers (LinkedIn Talent Solutions) — the gap the Handbook is built around. The STAR structure is the framework recruiters are most often trained to score against.
Salary: a debate we name rather than settle
The salary chapter takes a deliberately careful position, because the evidence here is genuinely contested. We do not pretend the debate is resolved. What is not in dispute is the individual lesson: asking once, calmly, with a defensible number, is a low-risk move with real upside. The book holds the debate open and the advice firm.
- Babcock, L. & Laschever, S. (2003). Women Don't Ask. Princeton University Press.
- Artz, B., Goodall, A. H., & Oswald, A. J. (2018). “Do Women Ask?” Industrial Relations 57(4): 611–636.
AI in the interview: named as a moving target
The fastest-changing material in the book is the role of AI — both the tools that screen candidates and the temptation to use AI to answer questions live. We treat this as a trend still settling, not a settled fact: the body names its sources on the page where each claim appears, drawn from 2025 industry and academic work, precisely because the specific numbers vary by who ran the survey and will move. The one durable conclusion, from both sides: prepare with AI; don't perform with it. The chapter carries a revision commitment within twelve months of release.
On hiring timelines
The format chapter uses time-to-hire benchmarks to set expectations — currently around six weeks from opening to accepted offer in the US market, and shortening across most markets through 2025–2026. These come from recruiter and learning-industry round-count benchmarks (Coursera, SEEK Talent), so we state the direction — shortening — and the rough magnitude rather than a single fixed number.
What we don't claim
The AI-in-interviews chapter is the clearest place where we describe a trend, not a law — and where that is true, the book says so, names the source, and carries a revision date. We make no claim that this Handbook guarantees an offer. The interview is yours to sit; our job is to make sure the preparation you bring stands on something real.