Image Description -  0696-1

This is an unlabeled equation expressing the reliability index in terms of the 
inverse standard normal cumulative distribution function.  The functional dependence 
is first expressed in terms of reliability and then in terms of the probability 
of failure.  The equation is the Reliability Index (Beta) equals the inverse 
standard normal cumulative distribution function (Phi raised to the power of 
negative 1) times Reliability (R).  This is also equal to the inverse standard 
normal cumulative distribution function (Phi raised to the power of negative 1) 
times one minus the probability of failure (P sub f).  The equation continues 
indicating that this term is also equal to the negative of the inverse standard 
normal cumulative distribution function (Phi raised to the power of negative 1) 
times the probability of failure (P sub f).