(Extracted from Zero to One by Peter Thiel)
Unlike corporate giants, early-stage startups are small enough that founders usually have both ownership and possession. Most conflicts in a startup erupt between ownership and control—that is, between founders and investors on the board. The potential for conflict increases over time as interests diverge: a board member might want to take a company public as soon as possible to score a win for his venture firm, while the founders would prefer to stay private and grow the business.
In the boardroom, less is more. The smaller the board, the easier it is for the directors to communicate, to reach consensus, and to exercise effective oversight. However, that very effectiveness means that a small board can forcefully oppose management in any conflict. This is why it’s crucial to choose wisely: every single member of your board matters. Even one problem director will cause you pain, and may even jeopardize your company’s future.
A board of three is ideal. Your board should never exceed five people, unless your company is publicly held. (Government regulations effectively mandate that public companies have larger boards—the average is nine members.) By far the worst you can do is to make your board extra large. When unsavvy observers see a nonprofit organization with dozens of people on its board, they think: “Look how many great people are committed to this organization! It must be extremely well run.” Actually, a huge board will exercise no effective oversight at all; it merely provides cover for whatever microdictator actually runs the organization. If you want that kind of free rein from your board, blow it up to giant size. If you want an effective board, keep it small.