Interviewer training program: what it contains, tracks by seat, sign-off, refreshers, pool size and metrics

An interviewer training program is the standing system that qualifies people to interview and keeps them qualified: a foundation course every interviewer takes, a briefing on the interview kit for each role they will interview for, supervised practice through shadowing and reverse shadowing, sign-off against written criteria, refreshers on a schedule and when the data says so, and a register of who is qualified for what. Google says its interviewers are "only eligible to interview once they've completed training", and the US Office of Personnel Management's structured interview guide states that interviewer training increases the accuracy of the interview. Size the program from the interview slots you need to staff, and judge it by what trained interviewers produce.

The individual pieces already have their own pages: the sign-off checklist and a 90-minute session agenda in interviewer training, supervised practice in interviewer shadowing, and scoring alignment in interview calibration. This page puts them into one program with an owner, tracks, a register and numbers.

What does a complete interviewer training program contain?

What should the foundation course cover?

Two public sources set out the core, and they agree more than they differ. OPM's Structured Interviews: A Practical Guide (September 2008) includes a sample lesson plan (Appendix E), and Google's re:Work guide to effective interviewer training (updated March 2026) has a checklist of what trained interviewers should know.

Two modules are worth adding for 2026. First, notes and recordings: what interviewers may record or transcribe, the consent wording, and where notes are stored (see the interview recording consent script). Second, the off-limits topics in your own states and for your own roles, from the EEOC's prohibited practices and pre-employment inquiries pages and the site's illegal interview questions list. The signed commitments that go with the course are in the interviewer code of conduct.

How do interviewers get signed off?

1. Foundation course completed, including a practice scoring exercise.
2. Kit briefing for the role they will interview for.
3. Two shadows, scoring silently and comparing with the host afterwards.
4. Two reverse shadows, leading while the host scores independently.
5. Sign-off by a named owner against written criteria: core questions asked as written, scores on the same side of the bar as the host's, notes that record the candidate's words, scorecard submitted the same day, no off-limits topics pursued.
6. Entry in the register, with the date and the kits they are qualified for.

Readiness is a judgment against those criteria, not a count of sessions. The observation checklist and the conversation after each shadow are in interviewer shadowing.

Which seats need their own track?

• Hiring managers: owning the decision, running the debrief without speaking first, selling the role honestly, and keeping the offer stage lawful (pay history rules, for example).
• Independent interviewers: people who sit outside the hiring team to hold the bar steady across teams, in the spirit of Amazon's Bar Raiser, which Amazon describes as "a specially trained interviewer" acting as an objective third party (Amazon, as of November 2026).
• Debrief facilitators: speaking order, keeping discussion to evidence, recording the decision; the agenda is in the interview debrief template.
• Coordinators: accommodations, candidate communication, and interview-day logistics.

How many trained interviewers do you need?

Interviewers needed = interviewer-sessions per week
                      ÷ (max sessions per interviewer per week × availability)

Run the same arithmetic for screens and first-round interviews if different people staff them. How many hosted sessions the new interviewers need, and how long that takes at your interview volume, is worked out in interviewer shadowing; start training before the hiring push, not in the middle of it.

When should interviewers refresh their training?

• On a schedule: a calibration session at least once a year for every active interviewer (our suggestion, not a standard).
• When the kit changes: new competencies, questions or anchors mean a new kit briefing.
• When the law changes in a state where you hire, for example on pay history or automated interview tools.
• When the data says so: an interviewer's scores drifting from the panel's, late or thin scorecards, or a complaint about a question.
• After a long gap: someone who has not interviewed for six months shadows once before leading again.

How do you know the program is working?

Training matters to candidates as well as to accuracy: Google's re:Work page reports that "interactions with interviewers are a top-mentioned factor in candidate feedback", from its internal research. Measure what trained interviewers produce, compare them with interviewers who have not been through the program, and compare each cohort before and after:

What records should the program keep?

OPM's guide lists "training provided to the interviewer" among the things to record for each interview process. A register makes that a lookup rather than a search:

INTERVIEWER REGISTER
Name | Foundation (date) | Kits qualified | Shadows (dates) | Reverse
shadows (dates) | Signed off by / date | Seat tracks | Last interview |
Last calibration | Refresh due | Notes

Keep it with your other hiring records, and use it to schedule: nobody gets a loop invitation for a kit they are not qualified for.

Common mistakes