Well, I am hardly an Authority - having had my pullets for not even a year yet.
But Food seems to help a LOT.
My girls all pretty much ran screaming from me when I first got them @ 9wks old.
Gradually they have come around, which I attribute to treats.
They actually recognize the container I keep the raisins in - there's always a lot of discussion and interest when they see me carrying it.
And they know the bowl I bring every morning & evening has something more "special" than their pellets.
I can now pick each one up - ok, there is one holdout, but she's warming up too.
Now some of them even come to me asking to be petted or carried & 2 insist on being ferried from their roost to the floor of the coop every morning.
TAXI!
They also know where they live and it has become a lot easier herding them in that direction when they've been outside of the yard freeranging.
They will also come running in my direction rather than away - but again, that's probably because they are certain I'll have a treat handy