The document discusses the "Sell or Sign-Up" ground rule/philosophy for team decision making. It defines "Sell" as the opportunity for any team member to present new ideas or alternatives to influence team decisions. "Sign-Up" means that after discussion, all team members commit to supporting the final decision, even if they disagreed earlier. This builds accountability and allows the team to make decisions and move forward rather than getting stuck in endless rehashing. The document argues this approach helps create a high-performing team and company.