World top beach for According to the terminology of the International Organization for Standardization, services are results while service delivery is an activity. Another definition, by economists Valarie Zeithaml and Mary J. Bitner, on the other hand, sees services as deeds, processes, and performances and thus emphasizes their process character rather than that of final products. An alternative definition sees a service as a change in the condition of a person, or of a good belonging to some economic unit, which is brought about as the result of the activity of some other economic unit with the prior agreement of the former person or economic unit, explains T.P. Hill in a journal article. Implicit in this conception is a focus on change and a distinction between the production of a service and its output. World top beach 2016.