Intuition
The Big 4 (Deloitte, PwC, EY, KPMG) run consulting practices at huge scale, and their interviews often add a format MBB rarely uses: the group case. Instead of one candidate versus one interviewer, several candidates tackle a problem together while assessors watch from the side. It changes what's being tested. Solo cases measure your thinking; group cases measure your thinking plus how you behave on a team — do you lead without bulldozing, listen without disappearing, and push the group to an answer?
It's a subtler game: the candidate who "wins" the case but alienates the room often loses the offer.
Framework
What's distinctive about Big 4 / Deloitte interviews:
- Group cases. Collaborate to solve a prompt with 3–6 peers while assessors observe. They score behavior, not just answers.
- The collaboration balance. Contribute strong analysis and bring others in. Build on teammates' points, manage time, and help synthesize. Avoid both domination and silence.
- Solo cases too. Often slightly more straightforward/business-judgment-oriented than MBB; still structure, math, and recommendation.
- Written/presentation exercises. Some rounds include analyzing a pack and presenting — practice distilling data into a crisp recommendation.
Worked Example
In a Deloitte group case, your team gets a market-entry brief and 30 minutes. Strong play: early on, you propose a structure the group can rally around ("let's split into market attractiveness, our fit, and risks"); mid-way, you pull in a quieter teammate ("Priya, you mentioned regulation — where does that land?"); near the end, you volunteer to synthesize the group's view into a recommendation. You've shown analysis and leadership-through-collaboration — exactly the dual signal assessors are scoring, without ever steamrolling anyone.
Pitfalls
- Treating a group case like a competition and talking over others to look dominant.
- Going quiet to avoid risk — invisibility reads as no contribution.
- Forgetting that assessors are scoring teamwork and leadership behavior, not just who has the smartest idea.