people, time.
Facilitators—tray that has all the extra stuff you might
need (facilitator of best practice).
Equipment, other tray or some kind of kit, can be a cue
to better technique and a lack of it can be a facilitator of a
poor technique.
From tech level to the seasoned nurse, you have
individual personalities who care about the quality of their
own practice, and those who that are less than diligent.