Kingman’s equation provides insights into the mean waiting
time before a process. Machines usually have a queue before them, and John
Kingman described how a queue forms mathematically in 1961. He did this for a
single server. So, for a queue waiting for one process or machine. Kingman’s
equation is an approximation of the mean waiting time.
Three elements influence the time spent in the queue:
1.
Processing time of a job
2.
Utilisation of the process/machine
3.
Variation in the process or arrival of jobs
The principle behind Kingman’s equation to approximate the
mean waiting time can be expressed as:
Mean waiting
time = (Processing time of the Job) X (Effect of Utilisation of the Processes/Machinery)
X (Effects of Variation)