Capacity Planning for IT Networks
QoS - Quality of Service
QoS technologies support levels of predictable systems performance and network capacity. Elements of QoS include availability (uptime), bandwidth (throughput), latency (delay), and error rate.
Strategies in Network Capacity Planning
Microsoft's capacity planning white paper describes some best practices in capacity planning for IT networks.
Capacity Planning at Cisco Systems
Capacity planning tools and methods are described in this Cisco IT case study.