| Arrival Rate | Expected number of customers that arrive each period. |
| Exponential Distribution | Probability distribution often associated with interarrival times. |
| High and Low Degree Of Customer Contact | The physical presence of the customer in the system and the percentage of time the customer must be in the system relative to the total time it takes to perform the service. |
| Poisson Distribution | Probability distribution often used to describe the number of arrivals during a given time period. |
| Queuing System | Consists of three major components: (1) the source population and the way customers arrive at the system, (2) the servicing system, and (3) how customers exit the system. |
| Service Rate | Capacity of a server measured in number of units that can be processed over a given time period. |
