The features of service by a provider cannot be uniform or standardized.
Services are variable and difficult to control because a service is produced and consumed simultaneously, and because individual people make up part of the service offering, it can be argued that a service is always unique; it only exists once, and is never exactly repeated.
services are generated, rendered, and consumed at one time. The service can never be exactly repeated as the same point in time, location, or circumstances, or with the same configurations or resources, even if the same consumer requests the same service.