You forgot, 'Timing, Tempo & Rhythm'!
I'll add this for 'You' in my answer!
The start of the proper stroke
The proper stroke starts in the pre-setup routine. After analyzing the position that waits for you, determine what kind of stroke is needed to achieve a point. Before the player addresses the cue ball, he needs to decide on the rhythm and tempo for that particular shot. Use a couple of warm up strokes to get the feeling.
When addressing the cue ball, the cue tip should be fairly close to the cue ball before you start your backswing. The player should learn to develop the same number of warm-up strokes on every shot. This provides the rhythm component of the stroke.
I personally believe in the continuous straight, horizontal and vertical stroke method, and not pausing. If the player interrupts the rhythm, he may lose the timing and tempo he was trying to achieve. Another very important part of the stroke is crescendo, (increasing speed), never decelerating. Just remember, whatever number of warm-up strokes you choose to take, embed that into your game