Technical Report Testing Reliabilibility of Raster Report of Experiment with Kerckhoffs Students
نویسنده
چکیده
We are working on the development of an availability risk assessment method for telecommunication services, called Raster. Raster is described elsewhere. From previous research we know that Raster can produce assessments with reasonable effort, but we have not yet shown that its results are reliable (repeatable) and accurate (correct). In this Technical Report we report on an experiment that we conducted to test reliability of Raster. By reliability of a method we mean that its results are not dependent on chance or unknown circumstances. We tested reliability before accuracy, as without reliability it is difficult to test and improve accuracy. The results of a method may vary due to many factors, some inherent in the method and some due to the person applying the method, the environment during application, or to other aspects of the context in which the method is applied. The goal of our experiment was to test the variation due to factors inherent in the Rastermethod itself. To do so, we identified and analysed sources of variation outside the Raster method, took mitigating actions, and tested the effectiveness of these mitigations. From the results we were able to identify three sources of variation. Two of these could be attributed to the experiment setup, but is due to ambiguity in the Raster method. The results allow us to improve Raster, and suggested improvements are described.
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تاریخ انتشار 2014