Availability
Is the service present where and when it is needed?
Capacity
Can the network handle normal and peak demand without unacceptable degradation?
Reliability
How often is service interrupted and how quickly is it restored?
Access and quality
A technically operating system can still fail residents if service is unaffordable, inaccessible or poor quality.
Scope boundary. This page explains system relationships at a planning level. Real utility, transportation, emergency, structural, electrical, cybersecurity and public-safety decisions require local agencies and qualified professionals.