Alignment, to us, means bringing pieces into the same line - the same direction. The metaphor is that a magnet will make pieces of iron point toward it. Agreement is shared intellectual understanding. Tribes are clusters of people, and people are complex and nonrational at times. If a tribe is united only by agreement, as soon as times change, agreement has to be reestablished. If people learn new ideas or see a problem from a new perspective, they no longer agree, so tribes based on agreement often discourage learning, questioning, and independent thought. Tribes based on alignment want to maximize each person's contribution, provided that they stay pointed in the same direction like magnetized iron filings.