26.1 What Synthesis Means
Synthesis combines separate pieces of analysis into a higher-level conclusion.
Suppose you learn that revenue is stable, labor costs have increased substantially, and logistics costs have also risen. Simply repeating those facts is a summary.
A synthesis would be:
“The profit decline appears to be primarily cost-driven rather than revenue-driven, with labor and logistics accounting for most of the deterioration.”
Difference: A summary tells the interviewer what you found. A synthesis tells the interviewer what those findings collectively mean.
Whenever possible, synthesis should also indicate what the conclusion implies for the next step.
26.2 Why Synthesis Should Happen Before the End
If you wait until the final minute to connect your findings, you increase the risk of losing track of the logic of the case.
Periodic synthesis helps you:
- Check direction: Determine whether your analysis is still focused on the objective.
- Update your hypothesis: Revise your current view based on new evidence.
- Prioritize: Decide what question matters next.
- Communicate clearly: Help the interviewer follow how your thinking is developing.
- Prepare the conclusion: Build the final recommendation incrementally rather than from scratch.
Practical principle: Treat synthesis as an ongoing problem-solving tool, not merely as a closing skill.
26.3 Mini-Syntheses After Analyses
After completing an important calculation, exhibit, or branch of the case, give a short synthesis before moving on.
A useful mini-synthesis contains three elements:
- Finding: What did the analysis show?
- Implication: What does that mean for the client?
- Next step: What should you investigate next?
For example:
“Customer volume has remained stable, so declining volume does not explain the revenue shortfall. The problem appears to be lower average revenue per customer. I would therefore examine whether pricing, product mix, or purchase frequency has changed.”
This makes the transition between analyses feel logical rather than mechanical.
26.4 Updating Your Hypothesis
Synthesis should regularly change or strengthen your working hypothesis.
Suppose your initial hypothesis is that a company’s declining profit is caused by falling sales. The data later shows revenue is stable while costs have increased sharply.
A strong candidate explicitly updates the view:
“This evidence weakens my initial hypothesis. Since revenue is stable, I would now focus on the cost side, particularly the categories that changed most.”
Good behavior: Make changes in your thinking visible. This shows the interviewer that you are responding to evidence rather than following a predetermined path.
26.5 Connecting Individual Findings
The most valuable insights often appear when you connect findings that initially seem separate.
Imagine that one exhibit shows customer churn rising, another shows service response times worsening, and a third shows customer complaints concentrated around service delays.
Viewed separately, these are three observations. Together, they suggest that deteriorating service may be driving customer churn.
Synthesis question: “How do the findings I have accumulated relate to one another?”
Look for patterns of cause and effect, reinforcing evidence, contradictions, and common drivers.
26.6 Identifying the Emerging Answer
As evidence accumulates, an overall answer should begin to emerge before the case ends.
You might recognize that:
- The problem is concentrated in one customer segment.
- One cost category explains most of the profit decline.
- One growth opportunity is substantially larger than the others.
- The original hypothesis is no longer supported.
Once the answer starts becoming clear, use the remaining analysis to test the most important uncertainties rather than continuing to explore every branch.
Useful question: “What would I recommend right now, and what remaining fact could most change that recommendation?”
This keeps the final stages of the case focused.
26.7 Keeping the Client Objective in View
Every synthesis should connect back to the client’s original objective.
If the client wants to improve profit by $50 million, discovering a $5 million savings opportunity may be interesting but insufficient. Your synthesis should make that clear.
For example:
“The procurement initiative could save approximately $5 million annually, so it contributes only 10% of the client’s $50 million target. We therefore need to identify additional, larger opportunities.”
Keeping the objective visible prevents individual analyses from becoming disconnected from the decision.
Final principle: Synthesis is the thread that holds the case together. After important analyses, state what you learned, explain what it means, update your hypothesis, and identify the next priority. By doing this throughout the interview, you build the final recommendation continuously rather than trying to reconstruct the entire case at the end.
