jump stop

[Ralph Stubenthal]

Would someone please explain the intricate parts of the jump stop. I am having trouble figuring out just what is legal and what is not. A player is dribbling and stops dribbling(holds the ball)and then takes a step and then jumps and lands on both feet thereby having no pivot foot. But,
1) Is it a violation if, after the jump, both feet do not land exactly simultaneously?
2)Is it a violation if, after landing in a legal stop on both feet, to step with one foot to shoot and/or pass and release the ball before the foot returns to the floor?

I would also like some suggestions and just how to tell or to know or determine the exact time when a player has held the ball(stopped dribbling) and commenced the jump stop. Sometimes when I see the jump stop, I "feel" like the boy has possibly taken one step too many but I'm not sure. Most of the facets of the game I am getting quite proficient at but I'm am real weak at calling this move---please help me get it right, thanks, Ralph.