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SYSE.28:3 - Forces
| Force | Practical tension |
|---|
| Early feedback | Early detection reduces rework, but later transformations can invalidate the result. |
| Reliance protection | A final check can protect a receiving action, but may arrive too late to explain a preventable failure cheaply. |
| Reuse and currentness | Reusing a matching result saves effort; stale subject or condition identity makes the reuse unsound. |
| Availability | A failed checker can block useful work; silently bypassing it can permit the exact reliance it was meant to prevent. |