TQoSM: Total quality of service model

A distributed application may be composed of global services provided by different organizations and have different properties. Providing provisioned services is of primary importance due to the multi-tenant and potentially multi-provider nature of services. When selecting a service from many similar services, it is important to distinguish between them. Quality of service (QoS) has been used as a distinguishing factor between similar services and as a criterion for service selection. To date, the majority of research on QoS is not comprehensive in identifying QoS suitable for online open environments with diverse services. Even fewer studies have been conducted to identify the QoS evaluation techniques. However, there is a need to identify the QoS, build a comprehensive QoS model, and identify the QoS evaluation approaches. Thus, this paper proposes Total QoS Model (TQoSM), a generic QoS model that identifies the QoS for online services, and describes their evaluation approaches. Accordingly, this study helps the researchers in the online service discovery, selection, composition, compliance, ranking, trust, and general management areas by providing a generic QoS model and QoS evaluation approaches to follow in their studies. Experiments are conducted to test various QoS metrics from the proposed QoS model.