I remember reading something in the book (or the Under a Black Sun adventure) that said teamwork with skills took into account each person's characteristics and proficiency to create the die pool (though I can't find the reference for it again). For example:
Han and Chewbacca are fixing the communications array of the Millennium Falcon after someone (who shall be nameless) knocked it off while they were piloting the vehicle. For sake of argument let's say the numbers involved are as follows:
Han: Int 3, Mech 2
Chewbacca: Int 2, Mech 4
If Han was working alone, he'd get 3 dice (GYY) and if Chewbacca was working alone he'd get 4 dice (GGYY), now if they were working together you'd take the higher of the acting characters' characteristic and skill as your starting die pool (in this case, Chewbacca's Mech of 4 would provide four ability dice), then take the lower of their characteristic and skill to convert to proficiency dice (Han's Int of 3 would provide three proficiency dice) giving a total dice pool of GYYY for the work.
I believe this is meant to be different than the combat maneuver Assist (which provided a boost die).
Let me know I'm not crazy...
Edited by HanShot1st