Back to the Big Four: F, C, T, D

Seems I've trod this ground before but it bears repeating.
Here are the big four...
F
Fundamentals

• Do you have a resonant, centered tone in different registers?
• Can you play in tune with yourself and others?
  
• Can you hear the notes in your head before you play them?
  
• Can you keep a steady tempo?
• Can you subdivide correctly within that tempo?
• Can you begin the notes cleanly?
• Can you control all these elements as you play.. high and low? ...loud and soft? ...fast and slow?

C
Concept

• Do you know exactly what the piece should sound like?
• Do you know where you are going to breathe?
• Do you know where to crescendo? ...whether to use vibrato? ...how much accent to use?
• Do you know exactly what slide positions you're going to use?
  
• Have you heard multiple recordings of the piece?
• If a solo, do you know the piano part well?
• If an excerpt, do you know the piece as a whole?
• Do you know the meanings of all the terms?
• Can you close your eyes and hear the precise sound of someone really "nailing it?"

T
Tension

• Are you aware when tension builds in your body?
• Is your posture well-balanced?
• Is your playing a natural extension of relaxed breathing?
• Is your tongue relaxed? Your throat? Your shoulders?

D
Distraction

• Are you so focused on the music that you don't notice what is going on around you?
• Have you quieted any "inner conversations" about your playing, good or bad?
• Are you " in the moment?"
• Do you "disappear into the music" as you play?

I'm sure I missed a few but this seems to be a pretty good list.

Back to ye old performance equation...
P - I = R
Potential minus interference equals result.
Potential = (Fundamentals + Concept)
Interference = (Tension + Distraction)

Hope this checklist helps.