I've briefly played step 1 as shortness ask, steps 2 to 4 as transfers and raise as preemptive. Over the transfer opener accepts with shortness or xx, with Ax/Kx/Qx they bid lowest new suit below 3 nt or 3 nt if no new suit is available. Higher new suits show shortness and support, and rebidding opener's suit shows a semisolid or solid suit. Things are slightly different after a transfer with step 4, the suit under opener's suit. I liked it but dropped it because of memory strain. Can give some more details if anyone's interested and when I'm not on my iPad.