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Judgment improves when dissent is safe but costly.

Standards exist to protect judgment, not replace it.

Judgment is most strained when tradeoffs threaten identity.

Judgment is revealed by which costs leaders are willing to absorb.

Judgment requires accepting that some losses are the price of coherence.

Stability is achieved not by eliminating variation but by managing it.

Judgment erodes when leaders treat standards as shields.

The more precisely you specify a requirement, the less room you leave for judgment.

Standards are most dangerous when they are treated as guarantees.

People do not come to work to do a bad job.

Rules become dysfunctional when they are followed without regard to purpose.

Technology shapes behavior more reliably than rules do.

Rules are best when they are treated as resources, not commands.

What you reward is what you get.

Systems fail where responsibility is diffused.

Judgment improves when leaders treat authority as a responsibility, not a right.

Judgment erodes when rules replace responsibility.

Reliability is the absence of surprises, not the absence of change.

Judgment fails when leaders treat uncertainty as incompetence.

Every standard carries an implicit theory of failure.

Safety is not a component, but an emergent property of the system.

High reliability is not the absence of errors, but the presence of capabilities that detect and contain them.