This Supermarket is a retail business unit that sells all the necessities of daily life such as groceries, beverages, 
household products, and so on. With the various needs provided by this supermarket, this makes the supermarket 
always filled with customers, causing a long queue at the cashier. To improve efficient service, it is necessary to build 
a queue simulation with the aim of reducing waiting time and work in progress on the cashier system. This research 
was conducted by using the Arena Version 14.0 application and using a discrete simulation method, namely a 
simulation method that discusses a model system that is always evolves due to the representation of changes in 
variables under certain conditions at certain times. This research results in two improvement scenarios, for the first 
scenario, namely adding two additional servers and adding two operators on the server and for the second scenario, 
adding one additional operator to the two servers. The average waiting time on the first repair is 0.2454 minutes and 
the average work in progress is 7.43. Then for the second improvement, the average waiting time is 0.055 minutes 
and the average work in progress is 2.77. Therefore, it is recommended for this supermarket to add one operator to 
both cashiers to speed up service to be more efficient.