Lovelock and Wirtz (2007, P.420) describe that researchers argue that the nature of service
quality requires a distinctive approach to indentify and measure service quality. The
intangible, multifaceted nature of many services makes it harder to evaluate the quality of a
service compared to products. Because customers are often involved in service production, a
distinction needs to be drawn between the process of service delivery and the actual output of
the service which is called technical quality. Other researchers suggest that the perceived
quality of service is the result of an evaluation process in which customers compare their
perceptions of service delivery with the expected outcome.