How BCG interviews work
BCG typically runs two interview rounds, each with two interviews. Every interview contains a case component and a behavioral component. BCG cases are interviewee-led, meaning you set the structure and drive the analysis. The interviewer plays the role of client and responds to what you ask. This is different from McKinsey's interviewer-led format and requires stronger initiative from the candidate.
BCG also uses a written case in some markets and for some programmes. This involves reading a set of materials and preparing a structured recommendation in 30-45 minutes before presenting to the interviewer. If your market uses the written case, practise reading client documents under time pressure and structuring a concise recommendation.
How to approach BCG case interviews
After hearing the case prompt, take one to two minutes to structure your approach. State the objective back to the interviewer, lay out the framework you plan to use, and ask for confirmation before starting. BCG interviewers pay close attention to whether your structure is logical and specific to this problem rather than a template applied generically.
BCG cases often include market sizing, profitability analysis, or growth strategy problems. Work through quantitative sections carefully, showing your reasoning as you go. When you identify a key insight, state it clearly: "The main issue appears to be X, which suggests we should explore Y." BCG values synthesis and the ability to identify what matters, not just the ability to analyse.
BCG behavioral questions
"Why BCG?" BCG interviewers probe for genuine reasons. The firm has a distinctive culture around intellectual curiosity and a flatter hierarchy than McKinsey. Reference something specific: the BCG Henderson Institute, a specific practice area, alumni conversations, or something about the office culture you have researched.
"Tell me about a time you had a significant impact." BCG looks for people who drive outcomes, not just contribute to them. Show that you identified a problem, owned it, and delivered a measurable result. The word "I" should appear more than "we" in the action section of your story.
Market sizing questions
BCG uses market sizing questions to test structured quantitative thinking. Examples: "How many coffee cups are sold in London each day?" or "What is the market size for electric vehicle charging in Germany?" These are not about the right answer. They test whether you break the problem into logical segments, make reasonable assumptions, and calculate clearly.
A strong approach: define the scope, segment the population or market, apply assumptions for each segment, calculate, and sense-check your answer. State your assumptions out loud as you make them. If your final number seems too high or too low, say so and adjust the most likely variable. BCG interviewers specifically note whether candidates check their own work.
How to prepare for BCG interviews
Practise 20-30 cases with a partner using BCG's interviewee-led format. Focus especially on the opening structure and on synthesising insights rather than just reporting analysis. Many candidates can execute the analysis but struggle to say what it means for the client. Practice stating clear, confident recommendations even when the data is ambiguous.
For behavioral prep, prepare three to four deep stories covering impact, leadership, and collaboration. BCG behavioral sections are shorter than McKinsey's PEI (typically 10-15 minutes) but follow-up questions are still specific. Know the details of your stories well enough to answer "what specifically did you say in that meeting?" without hesitation.
Questions to ask your BCG interviewer
"How does BCG approach the tension between client service and internal knowledge development?" shows you understand the consulting model and are thinking beyond just delivering billable hours. "What has surprised you most about the culture here compared to what you expected before joining?" invites a genuine response and signals curiosity.
Avoid asking questions that are answered on BCG's website. Interviewers notice when candidates have not done basic research, and it reads as a lack of genuine interest in the firm specifically.