deletions | additions       diff --git a/sectionINTRODUCTION_.tex b/sectionINTRODUCTION_.tex  index c89a994..59aeb6d 100644  --- a/sectionINTRODUCTION_.tex  +++ b/sectionINTRODUCTION_.tex 
...
Reliability is defined as the ability of a system to serve a given function over time.  The reliability of the particle accelerator is very important for user facilities, like storage ring based light sources;  but it is as well an important design objective for new types of facilities as accelerator driven systems or   new large scale facilities as for example the International Linear Collider\cite{Himel_2007}. Collider~\cite{Himel_2007}.  An operation metrics should quantify the reliability of a particle accelerator.  The calculation of operation metrics can be used to   quantify the improvement of a specific facility over time,  
...
and the statistical data reveal, how well the standards are met.  The authors are convinced that this metrics will refine our ability  to learn from the reliability comparison of light sources.