Lee's Notation
This article covers meaning & overview of Lee's Notation from operations perspective.
Published by MBA Skool Team in Operations and Supply Chain Terms
Last Updated: May 24, 2023Read time:
What is Lee's Notation?
Kendall Lee’s notation is used in queuing theory as the standard system to describe and classify a queue model.
A/S/c/K/N/D
- A – Arrival process
- M - Poisson distribution; random arrival process
- D – Degenerate distribution; Deterministic or fixed arrival rate
- G – General distribution
- E – Erlang distribution
- S – Service time distribution
- M – Exponential service time
- D – Degenerate distribution; Deterministic or fixed service time
- E – Erlang distribution
- C – Number of servers
- Can range from 1 to many
- K – Capacity of the whole system, i.e., maximum number of customers allowed in queue plus those being serviced.
- By default taken as infinity
- N – Size of the population from where customers are coming.
- By default taken as infinity
- D – Queue discipline, i.e., the order in which the customers in queue are being served
- FCFS – First come first serve; Default
- LCFS – Last come first serve
- SIRO – Service in random order
- PS – Processor sharing
- PNPN – Priority service
Example: M/M/1
This is a queue with poisson arrival process, exponential service time, one server, infinite system capacity, infinite calling population and FCFS order.
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