- time-averaged number of customers in the system (L) and in the queue ()
- average time in system (W)
- average time in queue ()
- Little's Law (consevation equation) in a queueing system, if
the queue length is denoted by L, the arrival rate is denoted by , and the waiting time is denoted by then

intuitively, it says the queue length is proportional to the arrival rate and the waiting time. Waiting time is affected by two parameters the arrival rate and the service rate.

Meng Xiannong 2002-10-18