Instructions: Given a text, write a compressed version of it in a single sentence.
Input: Intersubjectivity makes possible a second essential ingredient for creating the "zone": a support system that oers new ways of thinking about a situation. The quality of adult support varies with the type of joint activity.
Output:
Intersubjectivity makes a second essential ingredient creating the "zone": support systems making new ways. The quality of adult support varies with types of activity.