Customer
The customer is the evaluator/decision-taker and the one who shows preparedness to purchase the value as perceived, while the consumer is the person who consumes/utilizes the service/value. The 'customer' can be both consumer and customer at the same time. We may view management as the end-customers, and "Users" as the end-consumers of many IT services/products. Thus, the customer-centric approach is nothing else than a 'customer orientation'. But these are not the only customers in the system. Every application program has a set of internal customers. In order to provide enduring customer service excellence, ASPs need to have internal structures and processes in place that enable developers and systems maintenance providers to succeed in carrying out the tasks they do (ie., create end-customer service). Thus the relationship between systems within the organization and their effects on the quality of services and products delivered to one another. This is called a service chain, which assumes a set of interdependent sequential events that connect internal systems support with external service quality.