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\section{INTRODUCTION}   Reliability is defined as the ability of a system to serve a given function over time.  Reliability The reliability  of the  particle accelerators 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. 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,  
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The metrics serve to clarify for each facility the beam parameter promised to the users,   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.