Reliability threshold is 0.99, because you want a very low failure rate whereby the transition from SAFE to ARM occurs prior to 16 meters. Condence level of 0.95. because you want 95% condence that the minimum reliability of the arming distance is very high. For these parameters, 298 trials would be required so 298 test articles and targets. If you are evaluating performance on 60 launches with these parameters. you would expect 0.6 failures