I have read DiCarlo's escalation scale, I like it and find it makes a lot of sense, except for one thing. The gap between incidental 1 and overt 1 is enormous. Going from touching the arm to holding hands is not an easy, nor natural and incidental 2 often comes way before (and doesn't grant free access to Overt 1). Could it be that the examples given by DiCarlo not representative, or am I missing something?