•Throughput indices measure how much work is done by the system over a period of time.
•Throughput rate of a system is the amount of work done per unit of time.
•The system capability is the maximum achievable throughput rate.
•Throughput indices must be defined in terms of some unit of work: a job, a task, or an instruction.
•The more responsive a system, the greater its throughput.
•Utilization indices measure the proportion of time a system resource is busy.
•For example, the CPU utilization index is calculated by dividing the amount of time the CPU is busy by the total amount of time the system is running.