Robustness Principle

This principle governs system design, delegation, and decision-making.

Definition

A robust system:

• tolerates error
• fails softly
• degrades predictably
• does not require heroics to sustain

Fragile systems appear efficient until stressed.

Design Implications

Prefer:

• simple over clever
• explicit over implicit
• boring over brittle

Assume:

• people will misunderstand
• conditions will change
• attention will lapse

Design accordingly.

Human Systems

In human systems, robustness means:

• clear interfaces
• documented intent
• visible state
• recoverable mistakes

If a system depends on constant vigilance, it is already failing.

Rule

Design so that normal human behavior does not break the system.

Last substantive revision: 2025-05-24
Next review: after first failure