Need some advice on how to back out screws to allow for movement of table top

[Shift]

I'm about to start build a harvest table using 2" (1.5") pine ...

Lots of people suggest backing out the screws a bit when joining the table top to avoid cupping allow for seasonal movement.

My question is just how much do you back them out, and on which joints?

I'm assuming that it's only in the apron to table top joints, and not the edge joints between the actual table top pieces or any of the support structure. Do you back out the screws on the breadboards?

thanks

(corrected the title to avoid confusion for future readers)

[Ken Darga]

''Backing-off'' is safer than over-tightening, resulting in ''strip-out'' or loose joint.
One can always tighten up the joints in the assy, by use a hand tool driver.

That's my story, and I'm sticking to it.

Works for me.

Pierre Vallee said:

I wouldn't do the 'back off 1/4 of a turn' but do not overdrive the screw in against the shoulder either. Wood does move, expend and contract with temp and moisture. That's the way the pickle squirts.