Decisions can be categorized as two-way door decisions, which are reversible, and one-way door decisions, which are irreversible. It's crucial to recognize the difference, as one-way door decisions require careful consideration and should be made deliberately.

In companies, a one-size-fits-all decision-making process can lead to inappropriate application of heavyweight processes to all decisions, including lightweight ones. Two-way door decisions should generally be made by individuals or small teams, while one-way door decisions should be elevated to senior executives for careful scrutiny.

The principle of 'disagree and commit' is vital in decision-making. It allows team members to express their dissent while still committing to the decision made, fostering a collaborative environment and reducing second-guessing.

Compromise is often a poor resolution mechanism, as it can lead to decisions that do not reflect the truth. Instead, seeking the actual truth through proper analysis is essential, especially when the truth is knowable.

In situations of disagreement, escalating the issue to a higher authority is preferable to a war of attrition. This approach allows for a quicker resolution and maintains a respectful working relationship among team members.

To maintain high velocity in decision-making, it is important to create a culture that encourages quick and responsible decisions at all levels of the organization, as demonstrated by Amazon's ability to remain decisive despite its size.