System Availability

Summary

The percentage of time a system or service is available for intended use.

Conventional Definition

System Availability is commonly calculated as uptime divided by total planned service time.

Value Realization-Oriented Definition

In Value Realization, availability is valuable when it protects continuity, productivity, trust, revenue, or service obligations.

Notes

This draft measure is an indicator, not a complete proof of realized value. It should be interpreted with baseline, attribution, timing, confidence, quality, risk, and sustainability evidence.