What principle ensures the predictability of court decisions?

Judicial Precedent (Stare decisis)

A judicial precedent is a decision of the court used as a source for future decision making. This is known as stare decisis which means to stand upon decisions. To achieve predictability, our common-law system requires courts to make decisions in accordance with precedent.

would not cooperate with each other voluntarily.

new evidence is discovered.

oversights and errors are corrected,

new technology is applied to evidence.