Interviewer training teaches employees to run a lawful, consistent, evidence-gathering interview: designing questions tied to the role, probing for specific examples, taking usable notes, staying away from legally risky subjects, and scoring against a defined scale. It covers mechanics. Getting already-trained interviewers to place the bar in the same spot is calibration, a separate exercise.
Five things, in this order. Question design, so interviewers ask about the competency they own rather than whatever occurs to them on the day. Probing, because a candidate's first answer is usually a summary and the evidence sits two follow-ups down. Note-taking, capturing what the candidate said instead of how the interviewer felt about it. Legal boundaries, covering subjects that must not come up and what to do when a candidate raises one anyway. Scoring, including how to write a recommendation somebody else can audit. Add a practice interview with feedback, since nobody learns to probe from a slide deck. Keep the whole thing to a few hours and align it with the [hiring process documentation](/how-to-hire) your team already follows, so training and daily practice do not describe two different processes.
Because they default to conversation. An untrained interviewer opens with tell me about yourself, follows whichever thread sounds interesting, spends a third of the slot selling the company, then writes three lines afterwards that amount to a vibe. Two candidates for the same role receive two different interviews, so their scores cannot be compared to each other. The assessment also drifts quietly toward rapport, and the candidate who shares a hobby with the interviewer scores well for no job-related reason. Every other part of the funnel can be excellent and this one session still decides badly. It is also the cheapest thing to fix. A sourcing problem needs budget and months; an interviewing problem needs a half-day session, a question bank and a scorecard template inside your [recruiting software](/hiring-software).
Anything unrelated to the ability to do the job. Age, family plans, pregnancy, marital status, religion, health and disability, national origin, and in many places salary history are the recurring ones. Exact prohibitions differ by country and often by state or province, so the boundary has to be set with local counsel rather than copied from an article. Two habits keep interviewers safe in practice. First, ask every candidate the same job-related questions, because consistency is the strongest defence when a decision is later questioned. Second, if a candidate volunteers protected information, acknowledge it briefly, do not follow the thread, and leave it out of the written notes. Accommodation requests go to recruiting or HR, never negotiated inside the interview room.
Split it up. Run a short live session on question design and scoring, publish a written boundary guide people can reread, then use apprenticeship on real loops through shadow and reverse-shadow sessions. That last part costs almost nothing extra, since the interviews are happening anyway. Certify interviewers before they run solo, keep a register of who is certified for which competency, and reflect that register in whatever [interview scheduling tool](/interview-scheduling-software) books the panel, so uncertified people always sit alongside someone who is. Refresh yearly and after any policy change. The failure pattern is a one-time onboarding module nobody revisits while the panel doubles in size, after which new joiners learn interviewing by copying whoever they happened to shadow.
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