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The design of dependable distributed applications is a hard task, mainly because of the indefinable statistic behavior of the communication delays. Despite this feature, in practice, most system monitors make use of timeouts (a maximum waiting time) to ensure some termination properties in their protocols. To have better results, some monitors dynamically predict new timeout values based on observed communication delays to improve the performance and accuracy of the protocols. In the last years, time series theory emerged in the computer science area as a good tool to increase the prediction accuracy. The time series mathematical model is used to describe a sequence of observations of a stochastic process taken periodically in time. This paper shows how to model the round trip communication delay observed by a pull monitor (a periodic requester source), despite its non-periodic answers. As a result, this …