Services based applications are considered as support for both business-to-consumer interactions and business-to-business collaborations. However, service oriented computing (SOC) remains at the software level and business people cannot exploit fully its benefits. In this context, the intentional service oriented architecture (ISOA) suggests a move from the function-driven service oriented computing (SOC) to intention-driven SOC in order to provide service description understandable by business practitioners. Intentional services represented business oriented services in an intentional perspective, i.e. focusing on the goal it allows achieving rather on the functionality it performs. However, current intentional service omits the quality of service (QoS) dimension. In this paper, we focus on the quality elicitation process to apply for (1) capturing customers' quality requirements and (2) describing the quality of service on an intentional service specification. We consider that the elicitation of the quality of a service during the requirements engineering (RE) phase can contribute to a customer-centered adaptability of service composition by selecting the service composition that will satisfy customers' quality requirements. The aim is to provide a goal driven approach to reason on quality for both documenting intentional service and discovering the quality requirements of business customers.