In the paper we discuss a problem of non-functional characteristics uncertainty of web-services and service-oriented systems. To solve this problem a Bayesian inference is proposed to be used. Bayesian approach is based on using a priory distribution function of a random variable which is can be detailed on the base of actual observation. In the paper we propose Bayesian model of web services dependability assessment based on experimental measurement. This model can be also used to estimate web-services performance.
Web-services, dependability, uncertainty, Bayesian inference