Ring 1: Counting
Problem: Nursing/Safety Example: Doctor's Order is 15 units (quantity scale). Nurse measures 18 mL (volume scale). Why the difference?
Numerical Proof: Scale Check: Expected volume is $\text{15 mL}$. Measured volume is $\text{18 mL}$. Discrepancy: $\text{18 - 15 = 3 mL}$. The $3 \text{ mL}$ difference proves a critical error.
The Discovery: You discover the need to check the scale of measurement (units vs. volume). Your vigilance protects patient safety.
