Stress / Challenge Conditions for Design Verification Testing to Reduce Sample Size

[Tidge]

There is no physical or theoretical basis for the 5X statement...it’s a ‘rule of thumb’...

Is it a linear thumb or a logarithmical thumb?

 

[Bev D]

Is it a linear thumb or a logarithmical thumb?

To be clear I have never in my years of experience of testing at worst case conditions ever seen a reliable multiplying factor. This 5X statement is akin to the dreaded 1.5 sigma shift. It is fiction.