We are working on the development of an availability risk assessment method for telecommunication services, called Raster. 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 experiment we tested reliability, as without reliability it is difficult to test and improve accuracy. By reliability of a method we mean that its results are not dependent on chance or unknown circumstances. The results of a method may vary due to many factors. The goal of our experiment was to test the variation due to factors inherent in the Raster method itself. We identified and analysed sources of variation, and explain our 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. We conclude with proposals for improvement of Raster.
|CTIT Technical Report Series
|University of Twente, Centre for Telematics and Information Technology (CTIT)
- telecommunication services
- RISK ASSESSMENT