Some quick comments relevant to the posts since yesterday.
Interpretation is about interpreting the music not interpreting the choreography.
---
PE is about the quality of the execution of the movements, and the success of the skater in communicating the purpose of the program to the audience.
Here is a stripped down version of the analogy I use in seminars on the PCs.
CH is the script of a play. Say Hamlet. Is it a good script?
PE is whether the actor can speak his lines understandably and clearly, whether he can follow the stage directions without looking like a klutz, whether the actor can move around the stage without tripping over his sword and the scenery. It is also about whether or not the actor is successful in making the audience understand the action of the story.
IN is the about whether the actor can make the audience get inside Hamlet's head and understand not only what happens but why it happens, to provide motivation and elaboration of the character beyond what is in the words at face value. One actor may interpret Hamlet's motivation and the meaning of the story one way, another may have a different interpretation of motivation and hidden meaning.
As another example of differences in IN. Take Swan Lake. You have the same music and the same basic choreography, but you can do it the standard way or you can do it homoerotic (Michael Bourne's modern interpretation). Same music, same story, but a vastly different interpretation.
----
So why not put SS and PE together?
In some ways they are similar. Both are about the quality of movements. But they are about different types of movements. SS is about the quality and skill of the skating movements -- blades on the ice. Part of PE is about the quality, carriage and control of all the other movements -- not blade on the ice. PE is also about communicating to the audience and whether the audience "gets it" -- very different for me from the ability to skate blade on the ice.