Well here is an example of how it important it is to effectivly communicate from an ATC and student standpoint. A student, not mine, was doing his first solo and the dep rwy was 16. In order to get to 16 he needed to cross 16 from the tower side. So his instructions were to
"taxi to 16 hold short 16".
He had interpeted that to mean that he was to cross 16 and hold short on the other side prior to takeoff which you normally do. Instead the controller had meant for him to hold position on the ramp then taxi to 16. Needless to say his first solo ended there. See where you get out of the plane to let them go solo is fairly close to the hold short so he just crossed over thinking they meant for him to hold in the normal spot after the runup. To make a long story short the student wrote to AOPA about this incident and something got changed so when a similar situation occurs they just say hold your position.
Best experience.. Going into BOS on angel flights the controllers are awesome.