ABSTRACT
In any service industry there are essentially two types of products to be considered, product service and product supply. Product service can be defined as how the service has been provided, and product supply is what has been provided (this is, in many cases, what is commonly called product). The product service is usually provided through a service delivery process of a queuing system. The service delivery process is essentially described by a queuing model. This paper deals only with the product service.
