Fault-tolerance is an important issue in network design becausesensor networks must function in a dynamic, uncertain world. In thispaper, the authors propose a functional characterization of thefault-tolerant integration of abstract interval estimates. This modelprovides a test bed for a general framework which the authors hope todevelop to address the general problem of fault-tolerant integration ofabstract sensor estimates. They further propose a scheme for narrowingthe width of the sensor output in a specific failure model and give it afunctional representation. The main distinguishing feature of theauthors' model over the original Marzullo's model is in reducing thewidth of the output interval estimate significantly in most cases wherethe number of sensors involved is large
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