Describe a situation where you had to influence someone, perhaps a senior stakeholder or a peer, to adopt a new idea or change their approach. How did you persuade them?

Why This Is Asked
The PEI dimension 'personal impact' evaluates your ability to lead through influence, negotiate effectively, and build rapport with tough audiences. At McKinsey, you'll frequently need to gain buy-in from skeptical client executives for transformational recommendations.
General Approach
Choose an example where you didn't have formal authority, so you had to use data, relationships, or a tailored communication strategy. Be specific about how you understood the other person's perspective and tailored your pitch. Highlight the measurable impact.
Sample STAR Answer▾
Situation
As a senior analyst in a local bank, I noticed that our credit evaluation process for SME loans was heavily manual, resulting in a 10-day turnaround that caused us to lose potential clients to more agile fintech lenders.
Task
I needed to convince the chief risk officer to adopt a semi-automated scoring model using alternative data, despite his deep attachment to traditional judgment-based underwriting.
Action
Instead of presenting a theoretical proposal, I ran a pilot on a backlog of 200 past applications using a simple regression model I built in Excel, pulling in mobile wallet transaction data as an additional input. The pilot showed a 25% reduction in default prediction error without increasing portfolio risk. I then scheduled a one-on-one meeting with the CRO, framed the conversation around his known priority, maintaining asset quality, and demonstrated how the model could augment his team's expertise rather than replace it. I also invited a respected fintech partner to share how similar models had worked in comparable markets.
Result
The CRO approved a six-month trial for a new blended scorecard. Within the trial period, turnaround time dropped to 3 days, application volume increased by 40%, and the non-performing loan rate actually improved by 2 basis points. The project was later scaled to the entire SME segment.
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