Today?s business climate requires organizations to constantly evolve IT strategies to respond to new opportunities or threats. Tracking the achievement of business goals, objectives and strategies is increasingly used to measure and adjust the outcome of business processes. In this paper, we introduce a web service based approach for probing WSBPEL processes. With our approach organizations are able to automatically extend existing WSBPEL processes with auditing extensions which capture audit information during process execution time. We show how to transform a WSBPEL model into an auditable model which can be used for process monitoring purposes. Based on our experience on building an auditable WSBPEL model we propose some extensions to the WSBPEL specification.