This report describes the approach used to develop the system reliability metrics and the set of metrics resulting from implementing that approach. Initially published in June 2011 under Interim Report No. 1 and then updated and reissued in February 2012, this report replaces these two previously published versions.

There were no substantial changes or additions to the metrics since February 2012, although several metrics were changed from using a quantitative to qualitative measurement as a result of data and tool limitations and time constraints.

Note: All files are formatted as .pdf files and require Adobe Acrobat Reader to view.