An investment banker's job often involves tough decisions, keeping in mind the political changes, various macroeconomic variables and the market trends. The ability to take risks is important. You need to demonstrate adequate analytical skills and how they were used in managing risk associated with a particular deal. You should highlight the logical assumptions and calculated guesses made by you while undertaking a risky project or decision. In an investment banking career, it is often more about being "roughly right" than "precisely inaccurate."