This paper presents a short study on evaluating the web service quality based on finite state models using the well‐known metrics of Quality of Service (QoS) and Quality of Experience (QoE). These metrics represent objective and subjective assessments. The development of any web service involves several steps and the final values of the service QoS and QoE can be essentially improved/deteriorated based on the quality reached at each development step. In this paper, five service development steps are considered: those are requirements specification, provisioning, composition, implementation, and usage and management. At each step different finite state models for refining the service quality estimation are utilized. A running example of a vacation planner service illustrates the application of finite state models to improve the accuracy of the QoS and QoE evaluation