Encourage vicious debate and second-guessing *before* a decision is made, even rewarding it. But once the leader makes a final call, everyone must commit 100%, regardless of their prior stance. This separates the critique phase from the execution phase, allowing for both candor and velocity.

For an investment firm, the investment committee is not just a decision-making body. It's the primary venue where analytical rigor, debate style, and lessons from successes and failures are transmitted from senior leadership to junior members, shaping the firm's core identity.

FanDuel CEO Amy Howe adopted this McKinsey principle, which requires even junior employees to voice contrary opinions. This creates an environment where diverse perspectives are heard, ultimately leading to more robust and well-vetted company decisions.

A team that "gets along" isn't one that agrees on everything initially; immediate consensus is a red flag. True alignment comes from respectful, data-driven debate, followed by a unified commitment to the final decision.

To improve decision-making, BlackRock's investment committee, guided by a behavioral scientist, uses autonomous voting to prevent peer pressure. It also mandates a non-voting "challenger" to play devil's advocate and champion a pre-mortem perspective, ensuring dissent is valued.

In an effective investment team, the responsibility of junior members is to "attack" and "challenge" the lead portfolio manager's ideas. This structure leverages cognitive diversity to cancel out individual biases and leads to more robust decisions than seeking consensus.

At Founders Fund, intense, even loud, disagreements during investment committees are not a sign of a toxic culture, but rather one of deep psychological safety. The partners have such secure relationships that they can engage in "no holds barred, complete truth-seeking" without fear of political repercussions, similar to arguing with a sibling.

To combat groupthink, investment firm GQG hires former investigative journalists whose primary role is to argue against investment ideas. Their compensation is tied to making correct contrarian calls, not to agreeing with the portfolio managers, ensuring a culture of rigorous debate and uncovering blind spots.

Sequoia makes consensus investment decisions, viewing each deal as "our investment." This is only possible through a culture of high trust and "front stabbing"—brutally honest, direct debate about a deal's merits. This prevents passive aggression and ensures collective ownership.