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\section{CURRENT STATUS}  The definition of beam availability is important in order to judge the validity of a comparison of the numbers from different facilities.   A survey on failure analysis in 2008 of nine light sources\footnote{Survey participants for the failure analysis questionnaire came from: APS, ESRF, SPring-8, Diamond, SOLEIL, BESSY2, Elettra, ANKA and SLS.} revealed significant differences for the calculation of beam availability~\cite{Luedeke:2009aa}. availability~\cite{L_deke_2009}.  In the following we'll summarise the main findings of the survey.  In many cases the beam availability rules were determined by common sense: any event that prevented the majority of the users to measure was considered to be downtime.   Some facilities considered ``long'' injector outages - causing decaying beam operation - to be downtime, others accounted for these events individually.