Hello,

I have been trying out COMPASS for the past few weeks, but I have not quite managed to get what I want out of it. I am mostly interested in quantitative measures such as unreliability and unavailability.

Using the battery_sensor example provided with COMPASS, I could at least obtain a measure for unreliability in the Safety/Fault Tree Evaluation tab. However, this feature works by generating fault trees - I have been under the impression that COMPASS has more expressive power than fault trees. And I have no idea how to measure unavailability using COMPASS - the battery_sensor example is not repairable and neither are most of the examples provided with COMPASS.

I believe the Performability/IMC Analysis feature should also be able to give me quantitative results, but all I can get out of it is "Long Run Average: 0.0". I have noticed the warning "The root component contains ports. Performability results are undefined.", but even with a SLIM model I made myself featuring no ports in its root component, I get the same result. I am using a property of the form "Globally, {not sys.is_alive} holds eventually with probability > 0.0".

Is there any way to obtain measures of unreliability and more importantly, unavailability from COMPASS? Is the only way to get these measures via Fault Tree Generation?

Additionally, I have been wondering if there is any kind of archive of this mailing list - I have been looking for one but have not found any.

Best Regards,

Hermann Walth