DFR need a lot more.  here is the flavor
http://www.dfrsolutions.com/software/see-what-sherlock-can-do-for-you-2/
> It depends.
>
> There are SO many factors affecting initial joint strength, pad size being
> just one.  The perfect pad size, in the wrong place, with the wrong solder
> or poor processing can make a very weak joint.
>
> And still, it's no measure of reliability.  Poor solder joints are more
> likely to be weak.  Poor solder joints are more likely to be less
> reliable.  But poor older joints could pass an initial pull test and still
> propagate cracks and fail later in life.
>
> Peter
>


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