Consulting Fit Resources: Rank Firm Pages First

The best consulting behavioral resource is almost never a question bank. It is the firm's own interviewing page, read before you invent a single story.

Most candidates reverse the order. They collect prompts, skim STAR worksheets, then discover mid-prep that McKinsey wants one deep experience while BCG's skills interview mixes motivation with past examples, and Bain says some roles get a dedicated behavioural interview while others only fold behavioural questions into another format. The thesis of this guide is simple: rank primary sources first, then use structure tools and live rehearsal only against the competencies those pages name. After you finish, you should have a ranked stack, a scoring heuristic for your own stories, and one timed practice assignment.

CoachNed is independent of McKinsey, BCG, Bain, Deloitte, PwC, EY, and KPMG. Nothing here is confidential hiring guidance; it is what the firms publish plus how interviewers actually listen.

Why firm pages beat almost every other "resource"

From the interviewer's chair, a fit answer fails for one of three reasons: wrong competency, thin personal action, or a story that collapses under the second follow-up. No blog list fixes the first problem if you never opened the firm's page.

Industrial-organizational psychology has been blunt about this for decades. Schmidt and Hunter's 1998 meta-analysis put structured interviews near the top of selection methods (operational validity around .51 in their table, versus .38 for unstructured interviews). Firms that publish competencies and ask the same role-linked questions are not being bureaucratic; they are running the format that predicts performance better. Your job as a candidate is to prepare as if the interview were structured: same competencies, past behavior, evidence the interviewer can score.

That is why this roundup does not rank competitor prep platforms. It ranks what you can verify.

Ranked stack: what to open, in order

Use this as a sequence, not a brand contest. Each row should leave you with a concrete artifact.

Notice ranks 1–4 are free and primary. Ranks 5–6 are method. Rank 7 is practice. Skipping to rank 7 first is how people rehearse the wrong speech.

McKinsey PEI: the densest official page

McKinsey's Interviewing page is the single most useful PEI document still in public view. As of late 2026 it states that for most client-facing roles you get a personal experience interview followed by a problem-solving interview, and that PEI is where they hear accomplishments and challenges with your specific role and key actions.

The practical prep ask on that page is not folklore: come with two personal examples that show impact across the themes they list (open the page for the current labels; McKinsey has renamed dimensions before, and your invitation always wins). Budget for depth. In a typical first round I sit, one PEI story is probed for roughly 10–15 minutes. If your example only supports a two-minute anecdote, you will invent under pressure. That is a resource problem, not a personality problem.

Map each prepared story to one theme. Write the complication, your decision points, who else was involved, what you personally did (not "we"), and a result you can defend. Then stop collecting new themes until those eight examples (two per theme) are probe-ready.

For a longer walkthrough of dimensions and sample answers, use CoachNed's McKinsey PEI guide after you have read the firm page, not instead of it.

BCG skills interview and Bain behavioural design

BCG's interview process page names a Skills Interview that explores experience, skills, and motivation for joining BCG — "your chance to go beyond your resume" — before case and team interviews for client-facing roles. Recruiters on that page also note that answers are reviewed against values and core competencies. The resource implication is different from McKinsey: you still need past-behavior evidence, but you also need a crisp "why BCG / why consulting" that is not a pasted mission statement.

Bain is explicit on its Interviewing page that interviews are customized by role, that some roles include at least one behavioural interview, and that other interviews may only incorporate behavioural questions. Bain also states that candidates for a given role get the same questions to reduce bias. That is structured interviewing in plain language. Build stories that travel across prompts (leadership, conflict, initiative, impact), then check your invite for whether you face a dedicated behavioural slot or a short fit block before the case.

Do not assume MBB share one "fit" format. The three pages above contradict that assumption in three different ways.

Big Four: map to published frameworks, not generic STAR lists

Big Four processes vary by country and service line. Still, each firm publishes what it claims to hire against. Use those pages as your mapping sheet.

Deloitte's page is unusually concrete: craft genuine stories, do not invent them, and expect follow-ups that expose fabrication. PwC's Professional framework is the resource most candidates skip; interviewers who trained on it will hear "Trusted Leadership" even when they ask a plain "tell me about a time…" prompt. EY's UK careers material frames recruitment around skills and strengths rather than a long competency laundry list — prepare how you typically work, not only one heroic project. KPMG's public leadership and values pages give you vocabulary; your local invitation still defines the exact stage (competency interview, Launch Pad, and so on).

If you are applying to strategy arms inside the Big Four, still start with these frameworks, then confirm case format with the invite. Fit and case are scored separately more often than candidates expect.

A worked scoring pass you can reproduce

Here is a four-point sheet I use when a candidate asks me to grade a fit answer. Score each row 0–2 (absent / partial / clear). Total out of 8. Anything under 5 is not interview-ready.

Prompt: "Tell me about a time you influenced someone who disagreed with you."

Draft A (weak, ~90 seconds). "In my internship we disagreed on the slide deck. I listened to everyone and we found a compromise. The client liked the final version."

Draft B (stronger, ~2 minutes, still probeable). "At Meridian Grocery's pilot promo (invented company), the category manager wanted a 20% discount across all SKUs. I owned the pilot P&L. I pulled eight weeks of elasticity by SKU, showed that the bottom quartile destroyed margin, and proposed a 12% cut on the top half only. She rejected it twice. I asked her to choose one SKU to shield; we agreed on the house brand. Week-four promo revenue was +9% vs control with margin −1.1 pt instead of the −3.4 pt her plan implied. I learned to trade a smaller ask before I fight the whole frame."

Reproduce this on your top four stories. If a story cannot clear 6 without you inventing numbers, replace the story; do not decorate it.

Ned's rule. If I can remove "I" from every sentence and the story still sounds complete, I stop listening — you have not given me evidence of judgment under pressure.

Where CoachNed sits (honestly)

CoachNed's PEI / behavioral simulator at /behavioral is rehearsal infrastructure, not firm guidance. It asks a prompt, then four follow-ups, and scores delivery. Use it after ranks 1–4 and after a STAR pass, when the bottleneck is surviving probes rather than inventing themes.

It will not tell you McKinsey's current dimension names, will not replace BCG's skills-interview framing, and will not predict an offer. Treat it like a sparring partner that never gets bored. Everything on CoachNed is open for seven days with no card; then $120 for a recruiting season or $49 a month.

For the full sequencing of one story across firm lengths, see the consulting behavioral interview guide.

Practice this week

1. Open the firm page that matches your next invite (McKinsey, BCG, Bain, or the Big Four row above). Write the competencies or themes in a single column.
2. List six experiences from the last three years. Map each to at most two competencies. Drop anything that cannot survive "What did you do next?"
3. Score your best story with the 0–8 sheet. Revise until it clears 6.
4. Run that story once on /behavioral without notes. Capture the follow-ups you failed. Patch the story, do not patch the tone.

Ninety minutes beats a weekend of unread question lists.

Sources

• Interviewing at McKinsey — PEI format, themes, and two-examples prep guidance. Checked 2026-09-24.
• BCG Consulting Interview Process — Skills Interview definition and process steps. Checked 2026-09-24.
• Bain Interviewing — Role-tailored behavioural interviews and same-questions-per-role design. Checked 2026-09-24.
• Deloitte US: Tips to Prepare for an Interview — Story skills and STAR guidance. Checked 2026-09-24.
• PwC Professional — Trusted Leadership and Distinctive Outcomes hiring framework. Checked 2026-09-24.
• EY UK: Key skills — Skills-led recruitment and assessment stages. Checked 2026-09-24.
• KPMG: What we look for — Everyone a Leader attributes. Checked 2026-09-24.
• KPMG UK values — Published values language for behavioural alignment. Checked 2026-09-24.
• Schmidt & Hunter (1998), Psychological Bulletin — DOI — Structured vs unstructured interview validity. Checked 2026-09-24.
• MIT CAPD: The STAR method — Neutral structure worksheet. Checked 2026-09-24.