It's very simple. Don't over think it. Everyone over thinks it. Twist is the first thing you need to determine. Twist runs the length of the body part. If the length of the body part runs from right to left (like a forearm). Then the first rotation order is X If the length of the body part runs up and down (like a leg, or chest, or neck). Then Y is the first Rotation order If the length of the body part runs from back to front (like a tail). Then the first rotation order is Z. Chew on that for a second. The next Rotation orders really don't matter. You can't technically do it wrong. It will pose fine either way. But if you want the dials to be in the same order as the default figures. Meaning you want the "Bend" to be on the bottom in your list of dials. Then it does matter. So: If a body part has a Y twist axis. The rotation order would be: YZX If a body part has an X twist axis. The rotation order would be: XYZ If a body part has a Z twist axis. The rotation order would be ZYX It's very simple. But looks complicated. I'm still trying to figure out a way to explain it better. ScottA-- I don't use sperical JP's unless I have to myself. I prefer to widen the JP handles and use some cr2 trickery to set up body parts. But that's another story. :-)