The purpose of this case study is to investigate the effect of different queuing strategies on customer waiting times and queue lengths for the 8 checkouts of a supermarket. The case study displays five different strategies, with simple to complex modelling structures. The first strategy consists of building a M/M/8 system; secondly the service time is assumed to depend on the number of groceries. Further, concepts such as express checkout are introduced. In the last strategy, the number of opened checkouts is determined by the length of the queue. This is the prototype of a familiar queuing system.