Who still ties the weight forward leader? I learned about this in the early 80's. (No... 1980's
Your leader tapers down as normal, then tapers back up then down again to the tippet. This is suppose to aid in turning over bulky flies or to streighten long leaders out fully.
A typical example might be:
.021 .019 .017 .015 .013 .011 .009 .011 .013 .011 .009 .007 tippet section
These are diameters of leader material, the length's will be up to your own judgment.
Again, nothing is chiseled in stone...
It's just a different way to do things.