Time
Queue time
 Via queue
Lost


Server utilisation
 Queue
Number of servers1  2  3  4  5

Queue capacity
Customer loss if too low

Interarrival time (minutes)
Neg. exponential distribution  

Time to serve (minutes)
Triangular distribution
Min
Peak
Max

Simulation speedHigh  Medium  Low

Queueing space filled up → system instable. Change settings.